Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d78f94089597b4…

MALICIOUS

PDF

83.5 KB Created: 2021-04-06 05:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f4a927200cb0e19123769a96be9dd617 SHA-1: 216c18b3bdb602f24bee0a002bd620342c6d9549 SHA-256: 01d78f94089597b4e5fd1af5026b48dcde58edc9745615b520741647ee3f1deb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards an attempt to drive traffic to potentially malicious sites.

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://xezojetit.ru/123?utm_term=causas+de+la+anemia+falciforme+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376098/normal_6011f3f07afa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6018d9446b78b.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/phee4CZ/best_performing_investment_bonds_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_603dab6e88daf.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/2103365.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jgX4gcq/micro_pigs_for_sale_scotland.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/moxawez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_604875c4279d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_602a77b8a11a9.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/himsR3S/64955781600.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/mijumomub/71547019822.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/25051809278.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_111b863ff26e4d26967b8f7fcafb3504.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_8c731521726a4b62b61281f66ead14f1.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_843e3d5ac0e54be8809a8cd6bd858966.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukara/doors_level_18_answer.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_14678dee90b647dfa99d5ff538277be0.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 5364 bytes
SHA-256: 11fa95a5fb49e867b74192364ed9e5cec4345f5c65066e450956a2262519798d
font_01_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 12312 bytes
SHA-256: 21b0b7d5f2be1f73d2e046ee539cb70d7a7cb9e409b693c585354d0b32130177

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