Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7469a0d8bf81d4…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 00:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4dc546c5584b48ea3926b0c4055289d SHA-1: 2611d16f4e901d867e7fb2ca42f48f703a577f41 SHA-256: 8f7469a0d8bf81d4e5b5c4eb65cbfb30b1d107bb617deececdd043223c2cbcf0
246 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a credential phishing lure impersonating Walmart, directing users to a redirector hosted on 'weebly.com'. This suggests the primary goal is to trick users into submitting sensitive information. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/7b8fee289a3cb.pdf.
  • 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://golowaki.ru/award?keyword=ammo+45+certificate+pdf PDF link annotation
    • https://cdn.sqhk.co/zijatiki/guQthgG/halloween_costume_ideas_diy_scary.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/7b8fee289a3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_60160bbb3add9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_606281fd29200.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/xusirorodalune.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/gFsxthd/vutugod.pdfIn PDF document text
    • https://fojigexo.weebly.com/uploads/1/3/4/2/134235048/8728656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fea2d33a4fe2.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/24174328695.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/detemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_60199e143b3d6.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/jbiWKhc/94973336233.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/bMciejh/subway_train_runner_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/Qjejj2y/auction_sniper_free_download_rexdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_64ba6b5f0fba4a88a2a9026807a82a7b.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_f6d0395be7a14ababfc004240b8569ec.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_a367c6fc129f4783b94d592abbda51d7.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_de6a9023aca34c428d02c561ee7a5fc6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5292 bytes
SHA-256: db245beb7ef9edb9b4183663ed6f68c62050541fb364b66fc22fd37506734f29
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11296 bytes
SHA-256: a5c0ba497328e99beb9a5270054c18f6539773b2fb6505abd15a2ff8f4045dc7