Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaac5b2c76cfdea3…

MALICIOUS

PDF

71.6 KB Created: 2021-05-08 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8efe9f52951346a4c72dbcfc5b2242df SHA-1: d98e9e3f11cf1c17166c95a3c5273130a8c7ac31 SHA-256: aaac5b2c76cfdea37e15c1d0341080b6391ca79bea89b397b4e84b907a9e5e9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, with the primary malicious URL being https://vilenefex.ru/strik. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's purpose is likely to generate SEO traffic or distribute malicious links, rather than present readable content.

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://vilenefex.ru/strik?utm_term=the+redemption+church+lisle+il PDF link annotation
    • https://cdn.sqhk.co/gulifunanale/dGhegib/doravi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6059d588c34fa.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/cejihg8/rolling_dice_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_604302a618544.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/ic9jjji/animus_harbinger_mod_apk_1._1._7.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/jdjfjgO/46736153145.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/60623099463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabotojixupi.atwebpages.com/us_army_uniforms_wwi.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/the_bullwhip_effect_in_supply_chains.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/faxavorevumafegosuwik.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_6785be6a843848ccaf9a979d15bcd7a0.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_68ec42dc8304407a83564ffff94343b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/napewuxijiwene.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/13584960178.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/dosugefixupodirigonibotit.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/judelok.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/what_to_write_in_a_card_to_your_godson.pdfIn PDF document text
    • http://wififeju.atwebpages.com/99475673896.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_3759102145014dbc8f0e21d3a08e7440.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 5052 bytes
SHA-256: 272e92f098f5424caba8aaa0ee0c2e48f1ea5a361a087035131f84ba794adb2e
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 11044 bytes
SHA-256: 32577c94f83c0c95fe1807aa7912f2df5a2982ea679731a21155d54994942455

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