Malicious PDF — malware analysis report

Static analysis result for SHA-256 2809c4c8e66da3b0…

MALICIOUS

PDF

68.3 KB Created: 2021-03-11 08:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87b2c57044c0331e09a087135ada2bcb SHA-1: 997e75a2eef0858dcbc33e30a4703037435de303 SHA-256: 2809c4c8e66da3b03cac2cc3697203ee428db5db61bd1a6b893cb85b6bde5fff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://dafemum.ru/123?utm_term=canva+template+instagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380699/normal_602b0ec2ab00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_60494ff884675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_60341050155da.pdfIn PDF document text
    • http://amorexpo.com/boy_scout_manual_202073zs6.pdfIn PDF document text
    • http://prechambre.xyz/xudevinupeduo3czs.pdfIn PDF document text
    • http://boxberry-24.cc/81326983713alcnz.pdfIn PDF document text
    • http://creditscorefix.info/89494515829ea0py.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/cuantos_libros_son_juego_de_tronos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_600ec0b19e6b8.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/51145479686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fe0353486cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424400/normal_5fffb58662d85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_ba54d317008d4e798cd57624ae0a7d48.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_1b3d5a1323664023b3d8540395bd7c46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e3c16d-b293-45c5-8d33-9c10e6da9cca/eventide_h9_harmonizer_presets.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_3aad43de4d7c48cc9715f357b6053535.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e3111b-e26b-4148-99d4-61d59a0e7c1f/tojujito.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_e402713b979d4924b7bb5d3176994f48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc3146a-a3ae-4e50-80e0-470301ddba2a/dofuzugava.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_e3b18df7ed4741e2b03d19dac1c928b9.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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5104 bytes
SHA-256: 0602340ebb8fa5feba1abe0072991cb05b32ce88ec3044ed936c2d2d0c936b9f
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10240 bytes
SHA-256: ccd0f12d6746761c3717e1908e555473b2ea5de49a30f3b66f061210acee12c2

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