Malicious PDF — malware analysis report

Static analysis result for SHA-256 837de0054dbb5c98…

MALICIOUS

PDF

71.8 KB Created: 2021-03-16 15:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3238a7501ffa5b4753335f9d2f40570 SHA-1: 244b35c620381cddd04a946d4a595478a9864d41 SHA-256: 837de0054dbb5c98e8e9a207265993ba8c91ec37691fa950870b17bb4bbb3452
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

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-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://nipisod.ru/strik?utm_term=dell+m6800+drivers
    • https://cdn.sqhk.co/nivatasob/geqhhN2/20742197438.pdf
    • https://cdn.sqhk.co/dijadive/jfRazic/zigimirat.pdf
    • https://cdn.sqhk.co/dibitarebizu/hcgeE8I/zumuliwo.pdf
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fd1d1d649d3b.pdf
    • https://cdn.sqhk.co/soxuxopova/giuiahh/nfl_schedule_week_12_espn.pdf
    • http://autobaff.xyz/watopiqj29s.pdf
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fdadf05e8bf1.pdf
    • http://yognat.space/google_test_c_tutorialyzecj.pdf
    • https://cdn.sqhk.co/zidezofa/eQT6Xid/fitibalad.pdf
    • https://cdn.sqhk.co/wogokodu/28hgtyC/basazaluxipinijevititepa.pdf
    • http://supernefritroller.xyz/begutizulaq0plm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_24319617db5f4e268e4fdf095a79aebd.pdf?index=true
    • https://s3.amazonaws.com/kozibowisenatu/dijikavojivaf.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_cbf3ded405e7486bab83dea9f7299235.pdf?index=true
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_5776016512ce4b4b8b4a9fa4bf8db0a0.pdf?index=true
    • https://s3.amazonaws.com/lurutopobi/45519566040.pdf
    • https://s3.amazonaws.com/muxegeza/kidun.pdf
    • https://s3.amazonaws.com/likerajatob/66694535741.pdf
    • https://s3.amazonaws.com/kigavanus/petef.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_off0000dd07.bin
864d06c4aaae2baa30418c0eaca44fabdbfc84fcc1e94232dd62e065cd5b9fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 5308 bytes
font_01_sfnt_off0000ef0c.bin
59e2d1c52897c28d90f8bd035aa3c19d9ae77cd208c9023c225e7c50d4122809		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10296 bytes

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