Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4c953cc09f38b7…

MALICIOUS

PDF

72.8 KB Created: 2021-03-11 03:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 176651e36a8b510ab9d1a01cd1a8bb9a SHA-1: 350981e8edf0771c24dc9698735604d75cf13069 SHA-256: 4a4c953cc09f38b769e497bb36748bdc33b4617a8cbf1605569cc392e6c7e5b7
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=the+water+table+is+a+boundary+between PDF link annotation
    • http://yildirimotobursa.com/953428131210kok7.pdfIn PDF document text
    • http://hamsterbig.com/how_to_choose_butter_lettuceb0o8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcf2164e51e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_6005fc6084b49.pdfIn PDF document text
    • http://shop-you.xyz/5285760949902mof.pdfIn PDF document text
    • http://outputqwvk.space/aura_kingdom_ninjaalf7d.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/xonosob_buvosove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fdba5e9a2814.pdfIn PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/lomekorazewukorubat.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/80c8340b-4c7e-4eb6-a851-8def01e7587c/whirlpool_washing_machine_instruction_booklet.pdfIn PDF document text
    • http://fituxulilofe.epizy.com/aluminum_clad_sheet_2024_o.pdfIn PDF document text
    • http://maxezexisog.rf.gd/33460964657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f6d0f2-b1d8-4571-9dcc-cac127e6c8fe/puximefilojijalut.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/99541539775.pdfIn PDF document text
    • http://fiwabafedazuv.epizy.com/tulotaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b34085-33fe-476f-8d46-9aa80d9dd395/lalorubibugobataf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e019cbce-1a95-4037-983e-cdd46e958b84/74564978870.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 5196 bytes
SHA-256: 4d522baa2779107867f28016f2cdfe967c1f28dad748fa8276efb15815835f13
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 11332 bytes
SHA-256: 4a1e8899d234fa078c0b1048442282e3cd67cdb3fb5bd0e3e2c8bcff46eb510b

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