Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff527ff19245b76…

MALICIOUS

PDF

78.8 KB Created: 2021-04-29 02:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f468621f4469999e0d6c8fb5df1e2f2f SHA-1: 93b07f5380107c9471c7f694502be6f1399aa4d4 SHA-256: 4ff527ff19245b7617de7bedf6a0b8834a1f78f574b5fe9671a8a41537a4943b
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 0.9998

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://maypoin.ru/strik?utm_term=kenmore+gas+stove+top+cover PDF link annotation
    • https://cdn.sqhk.co/tobamozusaj/hhd6tyL/soxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_606a0330b59ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394082/normal_5fe2e8d524111.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/jitofibik.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/7534229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_601da1bd9ef0f.pdfIn PDF document text
    • https://cdn.sqhk.co/liguvikozo/JeUhaii/jharkhand_pds_rice_vitran_report.pdfIn PDF document text
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/5050907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/065a9e64-46e6-4d50-a52f-7588d1ba9876/72746550319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14202acb-d406-4a11-aed0-fc49406867aa/wards_signature_sewing_machine_uht-j277d_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/unitedhealthcare_ms_can_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/81636325014.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/51199541851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ed5e81-a8f5-43df-8286-b878e5251d3b/how_do_i_pair_my_bt_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7fc9da-5950-4d22-9c5f-9c18f41080d9/how_much_is_a_good_used_rv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c25a52-b08d-4d49-a863-f707700066b2/london_poem_by_william_blake_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/which_rowenta_steamer_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e5fc49-c526-4483-aa53-5820dfa968d0/vuguxol.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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5252 bytes
SHA-256: 17ac8aa87a04c81a5ef37971ae667b305b935621ff6d4c58e1d4f12590e52810
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 11760 bytes
SHA-256: cf953b2c66b935ec5f5fbed79674ad7dff10deee5f773e67a0edeed239c498d9

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