Malicious PDF — malware analysis report

Static analysis result for SHA-256 c256fe842eed94dc…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 41fd8fe10c2fe059d3c0f40ddbc65881 SHA-1: aec0e6b20cd72cfd05ee9e120c4abb084f540741 SHA-256: c256fe842eed94dcc73d6bccae00eacc9856de158311c474d0ffddf7458112e5
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a website that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=minecraft+farming+valley+guide PDF link annotation
    • http://creamwalls.space/electrolux_vacuum_store_near_me927vz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_60418c659f84a.pdfIn PDF document text
    • http://stickerrus.ru/wisc_composite_score_classificationspgume.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/ijbmpCQ/lajugomaxavikuwanegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6049b6ab49fd4.pdfIn PDF document text
    • http://fsfsfd.xyz/walalegigetufomelafufactgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_60547eb25ccb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_601f95456070d.pdfIn PDF document text
    • http://dronextactical.xyz/7466353118kjvd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_6043bc7e1ca30.pdfIn PDF document text
    • http://xitnet.fun/16840523726dtlfo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/dtJ6zdS/e_pluribus_unum_coin_value.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/3264783699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4d3e2d-7467-4ea5-a6a0-3865726a6bd4/how_to_service_briggs_and_stratton_carburetor.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_dbe48f37744347bc97002a4ffdf81afe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/21858237113.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_5af60ac04f694d3a975d39e2ad219a0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d6c323-d720-4cde-95a2-2716cddce1f1/26234926069.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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 5332 bytes
SHA-256: ef44a51e8ccdb31b5eb9766feca816632b8721c6313fa60c6990666b0e46f573
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 10772 bytes
SHA-256: 11da036f85051d92ba8ebb6003edbf26b2100b56007fe2e8d8c62412107bd65b

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