Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f610fa05ccb920d…

MALICIOUS

PDF

71.9 KB Created: 2021-05-07 00:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206d7674e7b95f6b67509221accc0002 SHA-1: b506c9ac128fd50c4240eb97ec556b2321ee0a5c SHA-256: 9f610fa05ccb920d685d3820dd5fa9c808749fa73ea46cc120c6c1c6fc030d84
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=kuby+immunology+8th+edition+pdf+download
    • https://cdn-cms.f-static.net/uploads/4481056/normal_601b47768e2c7.pdf
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/dutiwuwo.pdf
    • https://cdn-cms.f-static.net/uploads/4402948/normal_606df91d81dc1.pdf
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/ponad-sanate-xoxixu.pdf
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5fef849c1c3d6.pdf
    • https://cdn-cms.f-static.net/uploads/4376625/normal_600d8760b3589.pdf
    • https://cdn.sqhk.co/nobixapo/pojjDpo/37732936413.pdf
    • https://cdn-cms.f-static.net/uploads/4465018/normal_605f3f6197175.pdf
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/1075639.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/4c5b4835cf0bef.pdf
    • https://cdn.sqhk.co/bogovureg/kbthg46/pokofurimapolev.pdf
    • https://static.s123-cdn-static.com/uploads/4408878/normal_6008a0be28792.pdf
    • https://cdn.sqhk.co/pezolaje/jfxSies/to_the_moon_gameplay_length.pdf
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/nazudosejupiworus.pdf
    • http://vipimuxatomefi.medianewsonline.com/94737538565.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_606ca2debc008.pdf
    • https://cdn-cms.f-static.net/uploads/4422640/normal_601fac89e37d0.pdf
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff69f0d3ccd1.pdf
    • http://sesesuruko.mypressonline.com/lukalopekoxaponadesi.pdf
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5fdd769f90abb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_34ba7a3bb65f4e74bd345688dd4d14a9.pdf?index=true
    • http://bafuwujix.atwebpages.com/definicion_estudio_de_mercado.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_2951d27a57f44056b356b3eca7360159.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce62.bin
a0703ba61cd4bcfbfa37d9af5644402e48aa4443b3ab6d9697f773f786b07680
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 5560 bytes
font_01_sfnt_off0000e139.bin
9ca21dcdc02457258a60341f1be1fe7a3b01c89c71f54e97f40e06110bcbd905
pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 10160 bytes
font_02_sfnt_off000103ed.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 4324 bytes