Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3f953ee7e48072…

MALICIOUS

PDF

81.6 KB Created: 2021-05-09 04:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 63158ea76c4a0f0fcc1b5420ba1c09da SHA-1: 9d447c29fc6c1b7e07dfbc68802051d1f76fb8b4 SHA-256: 5b3f953ee7e48072db3d3d4e0433dacbcb8f51fa65cbed868ec7689455dda3df
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a technical problem ('why won't my lenovo laptop turn on or charge'). The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicates malicious intent. The primary IOCs are the suspicious URLs used in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=why+won%2527t+my+lenovo+laptop+turn+on+or+charge PDF link annotation
    • https://jijoromosuw.weebly.com/uploads/1/3/4/7/134714512/memisorurijidebaf.pdfIn PDF document text
    • http://vulenawaxoki.iblogger.org/classifying_quadrilaterals_chart.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/2574608691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_601401daaf1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_6069949419dda.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/riluvipuxubemaf-kekuwa-jedetovolakor.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/8111657.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_24188ffe61314a82b6459915dba73df3.pdf?index=trueIn PDF document text
    • http://viwivebobip.epizy.com/codehs_unit_6_quiz_answers.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_9f8d46889e7344b99c2af069ea7bb93b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taturi/rumexotuw.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_51459935a7b445609009203a669a0c43.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_2656bb9114814f3283d7be3515b2184f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/what_jobs_can_you_get_with_a_sociology_major.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_5b8106cc6f9e46d2acdbd8efa9f78366.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_8bcf7487da544b3cb15b18021dbe0917.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/attack_on_titan_season_1_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/sawunusetije.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_b3e0697b47114329b7248128dffee0a0.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_6c3b760eba184681ad3c043f8ce03d79.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 5304 bytes
SHA-256: d8a070dc5ffc2376d6e644669610b198401c01c432f4c95f8e8ff8415438028e
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 11700 bytes
SHA-256: 22423064fbe7a80017051ef5307f5bced2ade1aa79cb97423b158d8160821431
font_02_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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