Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a44b28f0c72f04…

MALICIOUS

PDF

83.2 KB Created: 2021-05-17 12:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 660c59c4e38b2c4bdcf8414834bf14f7 SHA-1: 085f0d1f49d2f2da3c4d74a0a44407cf3fb14b3c SHA-256: a1a44b28f0c72f04180b3fb99d73a2ef537ca8fedce1c814feb50fcf9e927586
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily garbled, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=esperanza+rising+en+espa%25C3%25B1ol+pdf PDF link annotation
    • http://i-men.ru/how_to_program_a_legacy_garage_door_opener_keypadxv1z5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_605d9b71015ed.pdfIn PDF document text
    • http://bubble1.space/negative_scale_factorfulou.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/he3dhbJ/59883123558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_602b2529b1f4b.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/gfPvE9g/13790842323.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/hb5ahba/formato_de_asientos_de_diario_en_excel.pdfIn PDF document text
    • http://betmoy54.com/bluestacks_new_version_free8at4q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fe53645f1e03.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/oM8igVV/salesmsg_business_text_messaging_free.pdfIn PDF document text
    • http://cucoupon.info/haareya_song_salimtoi7y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_ca7c726f84394f0c86c4ea7379164bb0.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_6f2824cee4ee4568bf1c28997b2a208e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/rolesezaxujigomiv.pdfIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_a6079a010a3d43c0b45d02a31884833b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/xifigotoluf.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_17b4ea7995d34246a25ad2be15a4bcff.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_769f6512a89c4c56ada4babf7cfac29e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/zidasibabajezirituz.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_de90aa85ac6a4310b6fb6ee46aa4c79b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/xujalawu.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_b37f98ffa70341748fc656e9f4736558.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_d2591f495589474b810fd5c796b826d2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5136 bytes
SHA-256: 3352bc992ae4ca17ef33988d32873832a6c17b17f13110718bea59ef773f6a36
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11972 bytes
SHA-256: 8bac508d67325841a06b78fc4ecc2fff469bb4c4a75913101aecd84c62765a05
font_02_sfnt_off00012f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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