Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d783ea982a14523…

MALICIOUS

PDF

68.7 KB Created: 2021-04-26 09:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e38f07c0e9f9e90b4ce677a64b0c638 SHA-1: 93916b78909a609375670da3260622a85c6563f3 SHA-256: 8d783ea982a145231fc383d1197e826c25d4729b327545ed3f90eda0833cdb58
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=music+notes+pictures+black+and+white PDF link annotation
    • http://sodaapp.club/tanazizilokoxirolesuzuwi9k5.pdfIn PDF document text
    • http://svoydvalend.xyz/11254376037sqt43.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/wakodamqm93h.pdfIn PDF document text
    • http://vostokzapad.su/zozusimojuj6oy8.pdfIn PDF document text
    • http://daliadiago.com/mazefiwavusuzutejea54ds.pdfIn PDF document text
    • http://yoptan.space/android_7._0_update_apky5fct.pdfIn PDF document text
    • http://vashastrahovka24.ru/3441330925897x6b.pdfIn PDF document text
    • http://picsonair.com/58243359245ybqfe.pdfIn PDF document text
    • http://reduslimitalia.website/lapolufukirononifewy7j3o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_3fe2b0ff8b72455aa814f72485af0126.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_a19bedb683014b9bba7be0213870b480.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df25a430-1e2b-4673-8fb3-b75d4708f85e/juwofepidija.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_28ea02e3a7c2413db52040038e6c1b9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/biblia_textual_4_edicin_precio.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_1c51a73b20e94676b9cb8381a16ac10a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5367e459-82e6-46da-811c-b12e9b7b5cce/kabimujeka.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_bb004964ee5843149f4d5edaee64c43e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7baf57-6276-446a-a9ba-4a06e1cda6a8/5.56_reloading_powder_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/fepovapubiwifawevugoni.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_54492d468cf24d6b99a8fbfebf3d8a53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/masevewi/formal_letter_writing_format_cbse_class_12.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 5460 bytes
SHA-256: 2117a9a40eca43cf21ccfc5c46b831974dd6e8c45b74da2b15cebcb787b9f320
font_01_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 10388 bytes
SHA-256: fdad9c83abbf400bbf9a2fd2883503fa8b31f6dbb599ca843579e2b30ceb8f4a

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