Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f9a0576726a349…

MALICIOUS

PDF

87.3 KB Created: 2021-04-01 22:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 89d9bc65945d26dc126cde015f75239e SHA-1: 7fd3eefc1d808ecbfe8f4aa3c2ca143cbefb5f0e SHA-256: 77f9a0576726a34980ce46398e3c175b6bd5aba4007778a575dd6d0639166cf3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique commonly used to redirect users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nipisod.ru/award?keyword=agenda+settimanale+2020+da+stampare+pdf PDF link annotation
    • https://gozataxuwo.weebly.com/uploads/1/3/0/7/130740141/tuxixugoko-fevasina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60437a03627a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_600fff86a4b54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_6008d00965d21.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/eDjjFgj/kipogojaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6016de6615089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fffa0c772b53.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/cjgSAgi/fixing_tiny_holes_in_drywall.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fee432dc72a7.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/digjjDC/banamiloj.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/igifhir/hitman_reborn_tsuna_vs_xanxus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9ebdd31c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_6002a64a11823.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/5851651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60372cb4afea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fe365b48778f.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://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_fc359ead033d4bbf866592f93db4cae1.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_d40815ad9ed14c168c68ed7ffaea2d65.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_3cbb4b4ac0ee4be28e1b973d9787fa7b.pdf?index=trueIn PDF document text
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_0c23cf2aa0f74bf88197ed3c8d6c04bc.pdf?index=trueIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_9f9a05ae3279409b991353ca3f72e9da.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_fdf5bd2d0db14456b90c025e49be760b.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_1bf3e5b62b0c4978833d3b005c241667.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_f1fee36ccbb448a5b6dd3934de35e1ba.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_99bafb8193c54ee39a9c69b00aca3e64.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_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 5304 bytes
SHA-256: d62984798a7fc1a67b58cc780a4825a828d905f3753849ef923db3b01a6e279b
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 12008 bytes
SHA-256: 4fb988ac65b0530ffbf524a1a48d96fa90f4a92d886471a1fedd395c0e4d8218
font_02_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3