Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a499fe271f15bbe…

MALICIOUS

PDF

67.4 KB Created: 2020-12-08 06:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39425cf104573f4b82fdf7cb5fdc2fc2 SHA-1: 97ab9124a2f5f908f23b42d8acf4eaba8b7a37ff SHA-256: 6a499fe271f15bbe97ae1eecc225b779c673eded71a79c2615dc118331a84438
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to leverage external resources for malicious purposes, potentially including the execution of JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dmc+5+codes
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/werejajazexis_wikaxalosuban_xawiruxuku.pdf
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/dudorilenubobovus.pdf
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/637586.pdf
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f93edce4705c.pdf
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/gifugibokika_puwekodogeg_tijabok_rabikedeteme.pdf
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/ziruzawonisavo_gubigurowokef_bivisurudexex_xitamunefudufug.pdf
    • https://zubawolovef.weebly.com/uploads/1/3/4/4/134481331/xogimukiwojired.pdf
    • https://bixanizutojez.weebly.com/uploads/1/3/4/4/134490846/zasunolidadopo_liravexo_vebolole_dujukozugagewo.pdf
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/3291036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc1057f405d5340f32a3beb/t/5fce4e76920f47545bc29ad6/1607356023053/3327090945.pdf
    • https://static1.squarespace.com/static/5fc662fb3dfdd95b60faa0a4/t/5fce5e8274a40730fbcb8b5c/1607360131017/nubufavebudozarapof.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5947e6d49a06bb89177d/1606375752318/89979192670.pdf
    • https://static1.squarespace.com/static/5fc3a0e816f6d44b07cfb956/t/5fc514d5e6d49a06bb33cf9e/1606751447957/sewotaxipikutizejaro.pdf
    • https://static1.squarespace.com/static/5fc3b1150b6b03258f46d597/t/5fcec8327379aa3597649cfe/1607387187179/dofalufojazibok.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2296e02d7d67505e0869/1606230678566/66062144184.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc7.bin
d880561164af95a3c731a6d25203ed17f150daf516d8219811ed4816fef17f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 4868 bytes
font_01_sfnt_off0000dd52.bin
2392aee525366afd825e5289c04bf6a1d218bdf55229bd4e58d629cb1343b2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10560 bytes

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