Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3e6fae51ab314e…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 09:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5910c327f2696b4306806c816fb01168 SHA-1: 08121547c899ebc500976cb943083fdfcee78c98 SHA-256: 3c3e6fae51ab314e88f049ef1549f7a952f043dcb1ff9e015a5122a47affa3c6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to public health definitions, likely serving as a lure.

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 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.
  • 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://bologen.ru/strik?utm_term=salud+publica+definicion+segun+autores PDF link annotation
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/d67d4edd119e.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/ZChdjet/25955601275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fcdb714802af.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ejfhhib/61080654389.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/5051978.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/2567214.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/gfFiiIk/76271831337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc9779b2a665.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/iiYe2ij/alto_s_adventure_free_for_iphone.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/b0406ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/cannondale_lefty_dlr_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/pefururafibime.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/ios_12._4_for_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/25275590763.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/tejuwawawomuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/41944224572.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/jakomuxixikosedujatedalo.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/pairing_android_phone_with_apple_watch.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

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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 5568 bytes
SHA-256: b3bf5f23c6e9da7a931a5c9fef53b20812458a43745ac726751505066bf45dc6
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 11296 bytes
SHA-256: 208bd9a115c32a42ce484fe932695c8dff744e736a08e38dc2810d921e737463

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