Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d48f13b1fa1ddf…

MALICIOUS

PDF

69.7 KB Created: 2020-12-21 16:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c6a6f5741272169d876f03c73cf4e02c SHA-1: 10e42b7180c934251b17706c0d541131ee2f7674 SHA-256: 23d48f13b1fa1ddff7a72efd44b1b8627cd85683d789d4d3af5f7f2bff8b1390
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://trafffe.ru/strik?utm_term=religious+synonyms+and+antonyms PDF link annotation
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/goxopulogor-durerapepufalig-jasuwa-tigewuz.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/zopuromowovugap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fa2011013f3b.pdfIn PDF document text
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/7807123.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/5bcf22648fa66dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fba50c0035c1.pdfIn PDF document text
    • https://dodonebonobegep.weebly.com/uploads/1/3/4/5/134597525/xelujujavelozok-vejuzelik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdc9c5f0a190b16b315bd63/t/5fdcfffd4f8a400417dfd2d9/1608318974899/app_backup_apk_for_android_2._3.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/custom_wheel_of_fortune_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bbd6bf-7296-46c0-b1a0-e4671f49193e/teroxitul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2765e717-9510-4fc6-9ed3-617aa91b034c/bivoregufesojisokabozokel.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/everfi_answer_key_module_2_banking.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfa54e18c5c478ec19209/1606285911805/begojozebimego.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe4418bc819f1cf4a4fb5d/1606304798984/dajavipuwabisoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e78c88-95c3-4267-993e-10b0fca4dd76/jimmy_neutron_mcspankys_latino.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 5156 bytes
SHA-256: 2607540a2d49dacf329592eab9ccd2e0fd70198de5d8936ef73b79ad6bcb69fc
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 10268 bytes
SHA-256: b5ec7faf798106e3373f6d9216cfd25cdc2ee31312ca7326334f6b449fc6e728

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