Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3b4b64201d338f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-17 05:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87fd36e58f3d5fa34bc662835e9657a0 SHA-1: 578a2437101a8d5c001724a71b589ce34018b59e SHA-256: 7d3b4b64201d338f01c2104478e54f123594210582c1332af8de0eab700455e8
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The primary heuristic firings indicate a malicious PDF designed to host a large number of external links, likely for SEO manipulation or to distribute malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://gimoguvi.ru/wix?keyword=mastery+george+leonard+pdf+espa%25C3%25B1ol
    • http://meetsucre.pro/8977572330824qr3.pdf
    • https://tizijepen.weebly.com/uploads/1/3/4/2/134234944/6128554.pdf
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/jaxezuluvo_dutaxi_zenodojow_jujataxoxilaj.pdf
    • https://static.s123-cdn-static.com/uploads/4481695/normal_6000a37dbadc8.pdf
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/xukalinox.pdf
    • http://itprod.space/resume_latex_template_harvardry9cz.pdf
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/boxezi.pdf
    • https://cdn-cms.f-static.net/uploads/4383586/normal_600a29282e9d0.pdf
    • http://wdd13.ru/xexebum0tecl.pdf
    • http://pro-komp-master.website/what_is_economic_developmenti6ce4.pdf
    • http://hiziryigit.online/551141627blypd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xijalovelokolep/ratenedokuferi.pdf
    • https://s3.amazonaws.com/xisakazelelinim/40917838752.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_e927677c342f46a6b967401627b045c0.pdf?index=true
    • https://s3.amazonaws.com/vexeliku/lunofesenuzekemafogip.pdf
    • https://s3.amazonaws.com/sixolose/zakoturisedoxaze.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_fde0c278d8f24512b676cd05510c1d48.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113b7.bin
353e1846c3edf3227a3057e713d8188f6aadfc8ed7012370340d069ec2758797
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 5528 bytes
font_01_sfnt_off00012667.bin
a3b9efee792aac7adf2a4f152bcfa0c683efb8062cd043827a8b188aa38cf3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 13192 bytes