Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ca6ef6810a003a…

MALICIOUS

PDF

68.2 KB Created: 2020-11-12 19:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bff09873a2d974b14563e3817ed1e81 SHA-1: 7c10a1ee91028d4bd6a1c251f7c4c753454df8ad SHA-256: 87ca6ef6810a003ad6892d55b8b20473a7c328480016151a9b07ed3e5ced22dc
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded external links, many of which point to suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=triangle+sum+theorem+worksheet+answers+kuta+software
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/rimotapiwo.pdf
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/5828137.pdf
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/1553276.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fa2edb28809a.pdf
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/sonarosipefowu-linajobolupixog-gamedawegak-roturavake.pdf
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/6986544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6541b6f-5cbf-4264-98f4-0d767cba5d2f/john_wick_720_p_download.pdf
    • https://uploads.strikinglycdn.com/files/69391d51-d42f-4c0e-ab5a-823bae42497f/jiwipon.pdf
    • https://uploads.strikinglycdn.com/files/6190dc68-9035-46df-ab82-41596141ee90/megasitivununujosatobezir.pdf
    • https://uploads.strikinglycdn.com/files/6c86b91c-c329-4f10-9bb4-55275ae0f561/35039628186.pdf
    • https://uploads.strikinglycdn.com/files/3b9ce433-fc2b-4a28-938b-49b1880a005a/pratt_acceptance_rate.pdf
    • https://uploads.strikinglycdn.com/files/d978893a-4494-4b41-bee9-a00c7a8476e5/navy_enlisted_ranks_pay.pdf
    • https://uploads.strikinglycdn.com/files/101e7eed-4fd0-4393-8729-d17be661b3e7/joel_karty_organic_chemistry_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/5b8754c6-c4a2-4cfb-a288-2f6f15e5904c/55181821476.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf5.bin
f0e871701b04ec741d34ccec8872341dab8910d0153cc65e49f4f6ad5b46e020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 5288 bytes
font_01_sfnt_off0000ded9.bin
2567923bf96f3a47e5d182219bd6804f1e97c6b54db2b6fac1fa4d102d146df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 10648 bytes

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