Malicious PDF — malware analysis report

Static analysis result for SHA-256 f370c396cceeccf9…

MALICIOUS

PDF

79.7 KB Created: 2021-02-12 23:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3ed83b2a4ba8f0de471f4f79d6efc959 SHA-1: b4fdb0103381cc89283a950021abbeb7f686da24 SHA-256: f370c396cceeccf9e93c8ad937da799bd2ccc1dc59f433099c55e8050dedcf43
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. It uses brand-impersonation credential phishing. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://waxalema.weebly.com/uploads/1/3/4/3/134364729/mewinupapot-rulowave-danom.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://crophysi.ru/wix?keyword=barbados+slave+codes+apush PDF link annotation
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/mewinupapot-rulowave-danom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_6011436ea80f5.pdfIn PDF document text
    • http://varnisvakq.ru/mutants_genetic_gladiators_cheat_enginecg52e.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/zoruxoxilamav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_601f1502a2594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_60078e0e0a563.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/xijixularav_najarovure_ginodagefipexax_lifigixigu.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/7851331.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/zuxewerotokidepapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_602256bf58a8d.pdfIn PDF document text
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/ad689.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/1e9d8f.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/ghoijib/regal_cinema_tomball_summer_movies.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/tulejopavor-kepovosogibut-waxezari-lubobuj.pdfIn PDF document text
    • http://milesnires.xyz/vebusunat5y1r.pdfIn PDF document text
    • http://gtomishebs.xyz/viper12as_datasheet0g1us.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/05f08e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 5412 bytes
SHA-256: c0122df804f243cc8025cfa23065fd36b92ffbad8d10bc99941d7371eed37e9c
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10360 bytes
SHA-256: 4461978bb1ed4fa494293c01692d9c891493e461d90448e7d66a4f571b4e25f6

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