Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e36cb991f8c7c6…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 23:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5bae9517002b94c7fd0c153d273b1bc5 SHA-1: 5e9eb2a3ac5420ef8230952b9b13771ac94de327 SHA-256: 01e36cb991f8c7c6fb0b113ac68c7d4a65b046a66da69dc943ffdd9655bb4273
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 0.9998

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://druttle.ru/wix?keyword=bloons+td+6+apk+free+download+full+version PDF link annotation
    • https://todifalaseb.weebly.com/uploads/1/3/4/6/134691997/391f7f330a34.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/b9e019ecedaf08.pdfIn PDF document text
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/baa0e90bc94c.pdfIn PDF document text
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/3099558.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/5789425.pdfIn PDF document text
    • https://vobubivozabu.weebly.com/uploads/1/3/4/3/134320693/jasopemurawonewa.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/lenetojixap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_605c73695d3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_603c524820b21.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/xoropekiso-mozuraxunaxu.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/fozekafax.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/7307412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_604630f9cdf9c.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/f59463f1-acf1-4ba7-b1d1-0d94b7ced8ae/reflexive_verbs_in_english_exercises.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_0422c5cfa522425da180ad949e9ca7e9.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_cff5ea0c60524254bdfe8ef2e1f151bc.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_fa540282d566438d9584f5517ab71594.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7880ee1c-9859-493f-b997-2c8dbc5acd4a/why_does_polar_attract_polar.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_424a0297ee544ec0b6cd97cbee6afa62.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_7dec5c13fdcc4173962fbc2db522d83f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5452 bytes
SHA-256: 4f123cc571f381ac8505664bce5e044bc89e2e6678fd40150f30eb5f0e4305c2
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 11196 bytes
SHA-256: 115133acd6c3a31f0a7c0527bc894a8ffb58105da29aa0e87cfb0baa9717a431

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