Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bc6b4cd5d49a4b…

MALICIOUS

PDF

85.5 KB Created: 2021-02-27 21:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fcd44937593fabdd7251709950f13a25 SHA-1: eb4e90ca0cbd0fcfa3cf26c06096e3236e4bd2f1 SHA-256: 27bc6b4cd5d49a4bf1c92c3d925bb5cca59515f9a137ef384eeb148330144e38
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead users to potentially harmful 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://leonvi.ru/123?utm_term=refinishing+kitchen+cabinets+before+and+after+photos PDF link annotation
    • http://mobufuwiwid.medianewsonline.com/32362344082.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/8sEpIAr/jirujedejukumoxusupev.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/2407651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5fde68c2d2d8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5fec775c405e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_600d78be18d0c.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/568048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_601d1b0fc10bd.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/dodge_avenger_sxt_horsepower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debiwelof/mahadev_aghori_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/physics_textbook_class_12.pdfIn PDF document text
    • http://kimitumepogamom.epizy.com/solvents_used_in_non_aqueous_titration.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/midnight_in_the_garden_of_good_and_evil_story_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/nudulavafowemodibaseted.pdfIn 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_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 5596 bytes
SHA-256: 72778c4abd5ca31efda12aeac1be201236cc1c2ba98a9e5170f5b4f0ca990052
font_01_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 11344 bytes
SHA-256: ba6a035dd3092827ecb323caa739da7d198cb4b9dae0d6846db7dc9007eb7a38

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