Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f87f5733d8357c…

MALICIOUS

PDF

62.3 KB Created: 2020-11-20 09:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dc1b65b66ab2818865254eec30ee0fee SHA-1: e4bb417c9fc18e181dab074b01da3744f58fea48 SHA-256: c2f87f5733d8357c72e77d418c6c3c3e489214a1abbc9e0969e571c758b8b042
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. 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 0.9996

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://traffnew.ru/aws?utm_term=concentric+circles+template+in+word PDF link annotation
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/figufamubim.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f9ca7edbac37.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/tizobajevi-dopebulixoni-javomumarilit-roruripofexede.pdfIn PDF document text
    • https://gebopudexor.weebly.com/uploads/1/3/4/4/134482947/5865896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f9f7d89c5259.pdfIn PDF document text
    • https://setisobizosepi.weebly.com/uploads/1/3/4/6/134670504/dibuvominopa_xanij.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/d3e4ca9503a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_5fa96dad60d85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/17922897-9bcb-49be-9df5-478bb8ef46f0/del_norte_county_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d5e543-1066-4b3a-94c5-d28fa084c6c1/calculo_de_madeira_para_telhado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acbb8fb-ca49-4c7c-bdf2-fb105de141a8/elite_dangerous_interstellar_factors.pdfIn 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_off0000b6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BA 5216 bytes
SHA-256: f06fc39a61fe9d0d06e3bd6bb3acd13cf4c79c9815a67b4a90fd64dfac7a03bb
font_01_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 10588 bytes
SHA-256: 16d4715a7139488c1484e6642bc67c262c0bd01579337a0480c25d066c8135d8

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