Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfbebf80504dc3b…

MALICIOUS

PDF

74.1 KB Created: 2021-05-01 01:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c62cfecb9b165acb7fb7e91f4e71117 SHA-1: 8b2565419f533b8a2a833da3b1e27260e25e4d39 SHA-256: edfbebf80504dc3b38680cb87046dbc00b079cdeb5affd1ad8f572b0ce39bfc2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=how+to+test+amp+draw+on+ac+compressor
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/5892853.pdf
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/mimoxifeleza_jibubilizasib_xeboxuzafiga_zekedazati.pdf
    • https://cdn.sqhk.co/gufezitaxato/QNhhji8/34027344272.pdf
    • https://kotimujisozun.weebly.com/uploads/1/3/4/8/134880640/8a6a22.pdf
    • https://cdn.sqhk.co/fagojefavap/OtgdKPQ/job_performance_evaluation_sample_answers.pdf
    • https://cdn.sqhk.co/besogevipadi/YidIgj6/92055954683.pdf
    • http://vovavipegum.getenjoyment.net/84248693021.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/2738887.pdf
    • http://vodabutopidaru.getenjoyment.net/rumawojo.pdf
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/maxalidonuviboruga.pdf
    • https://kuxorife.weebly.com/uploads/1/3/5/3/135313812/ronixuworuzawoz.pdf
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/rinif-tirabalovol-xoreko-miwikapoj.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/8b3ad.pdf
    • https://cdn.sqhk.co/mivadunoxo/cXijieE/89035381495.pdf
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/wodupokat_dosaxidomamuli.pdf
    • https://cdn.sqhk.co/luwibajik/lT9hiic/94851077638.pdf
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/katopovun.pdf
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/vufugolopeloteri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_1c91249d1a7e463a96f38780c49c58eb.pdf?index=true
    • http://supajiwa.myartsonline.com/73242979797.pdf
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_a09dc9aa1799471a8b55b49d6f29ec44.pdf?index=true
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_cedbc3b4e9784318ba458d6b334ef537.pdf?index=true
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_0263f163e72c427b8441aa3a01ce2a70.pdf?index=true
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_52a2f29693a94f9a82244fdbe0033850.pdf?index=true
    • 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_off0000e616.bin
4d110ef44076abe11fbf27138123d9fc9b85f153bd81ce3310e96bef2cffa640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 5240 bytes
font_01_sfnt_off0000f7de.bin
562102f474cbb56661041c3ca407cc9ba83f22c72f3f8a17fa574425a54f3fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10196 bytes

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