Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f824a57e67533…

MALICIOUS

PDF

103.4 KB Created: 2021-04-02 16:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58c9a75f6c3fee529f9c71f1401ddad4 SHA-1: f70a8105cea1c0d8f4fe82917a9b5e77a2e321f0 SHA-256: c84f824a57e675332fb656051486dc355900c37f9270f26c02a444f1a3c5a0ef
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=elm+creek+ne PDF link annotation
    • https://cdn.sqhk.co/dijabidasu/Ukxidje/learn_spanish_words_youtube.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/4e19e732.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/9097215.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/16854d23bd.pdfIn PDF document text
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/0b2d72a523a8c.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/moxid.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/jcQggic/xrecorder_high-_quality_voice_recorder_app.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376375/normal_5fef480cc1b35.pdfIn PDF document text
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/6507227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fd635ae4b960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_600738cfec957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5fda884175313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_303a6fabfcac44498ea509a343194523.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_87f5c5cc71d5413da64dd58d4a5cf6b2.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_d3172ee734c048d38b042ab57b240c89.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_4397bfb583c54f688d363fff56e94dec.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_777d1b8228124cbe9eaef02ad6691642.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACD 4576 bytes
SHA-256: f5d5ed8802c3c98cb65a26448075c9ad316fb61bd2f3460aec3afdddfb93b7f5
font_01_sfnt_off00016a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4C 11384 bytes
SHA-256: ef7f916151b7d2e8684930ca559c1a4046e7093b0efd8c898eff747e2919907a

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