Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac1a257ddc5d627…

MALICIOUS

PDF

86.3 KB Created: 2021-03-07 10:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cfb1990c1a7e2220a10cbe846c842b49 SHA-1: d3c2f27dfe07ce54eaa12e51a9d3d26afb19c44a SHA-256: 0ac1a257ddc5d6276d8a889fbe218d0f5917fb0c69fbfc138b676a2e76cd82da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/aws?utm_term=english+grammar+in+use+amazon+jp PDF link annotation
    • http://dofitodisibo.22web.org/how_to_make_a_trivia_game_on_powerpoint.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosukijabadizi.epizy.com/axon_user_guide.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_2903f3ccef9c4fe3bdaea165a3cbc90d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54977c8-a2db-46e8-a9e2-3f9b3d1c2b4d/85450276645.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_2d604abca3c744dd977b060cfb43dc0a.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_1b1694e83ce44691923195d02399c382.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6addb546-9bac-4af7-804f-d592e907a93c/68550896942.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_a0adecd239a74cbaa51096f4eb50bce9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12930065-a1e1-4a89-af69-c75aaf881fcc/suzuki_book_1_piano_accompaniment.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_12f372ef34bf41ebb8c80c9617748a6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d0eb0d-3f63-4bbc-b771-6da7d861d3ff/davinci_kalani_4-in-1_convertible_crib_assembly.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_c1ccae0fefc9431a8e778365884a93d2.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_9b71456c18224ed8b0bde2b1adf440a8.pdf?index=trueIn PDF document text
    • http://semisoriguregix.epizy.com/corporate_id_card_design_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749dd0f-83bc-4e8e-9a12-e2e61f490feb/75382203611.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_ecda26cd18b746fe981da1700b13ffb5.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_f4606b3f95f1464b995c57c6e9216e9e.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_f4cb246dfce5496c872986ed818d8e07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/779fc65f-1938-4221-b57e-d20dc0d51614/65965847534.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_f235bfc186f04a51824c0f51d664357b.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_ef4a1f91019545e59bc042f5f0bd42c1.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_bd6c3c89c3d54e4f9dc22e7fe2be5693.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b42c1f6-a958-402a-83db-ba7f6f5dfedc/flowchart_drawing_tool_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ace527-78c4-4fe4-a8d5-063a2ca26821/kovimud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 9040 bytes
SHA-256: 0172d91dcd5bc144e125007b8f2338b9afe480b858faf5eeea354ecf36b0a22f
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 5316 bytes
SHA-256: d63878691a4d5ccb53bc8aedd531838a25c8e142e23111ed8bbe695a464d4cf7
font_02_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10540 bytes
SHA-256: 75356f0259fc7b35948f7dfb2a5968c0128adbb5baf716f4f01fc8063fa277a5
font_03_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 16148 bytes
SHA-256: 3eaf1d780fdae88ad19fe9ca786ad2eae43a9ab55ff9efdbfd5c9731b2f70d99

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