Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf3bd32312c0cae…

MALICIOUS

PDF

86.4 KB Created: 2021-02-27 17:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3d9a93f5c9018143ad55791c656565cf SHA-1: 077f1de7444b781abb87ec1744296fe09b456278 SHA-256: bcf3bd32312c0caea033c478f446d5ec7e82915d3574f09ad18bd58abc25f7a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=eye+of+the+beholder+twilight+zone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602297b71ddf9.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/yPjiaFA/23593843813.pdfIn PDF document text
    • http://grizhoff.ru/google_material_design_guideline21pca.pdfIn PDF document text
    • http://nutristrike-shop.ru/82586766965tyeyp.pdfIn PDF document text
    • http://drilltech.info/amazing_mathematics_circumcenter_and_incenter_maze_answers24olw.pdfIn PDF document text
    • http://souve.me/adorno_negative_dialectics0l03c.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/kShdjdp/pacman_30th_anniversary_ending.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/jgVjeid/duplicity_synonyms_list.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/uChfMdL/saburajotojoj.pdfIn PDF document text
    • http://trychambre.xyz/92841497238288fx.pdfIn PDF document text
    • http://rastet-malysh.ru/34452429042hdfvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5fea221d5b249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_60063de820b2d.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/dejolavubukugeb/57467371504.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/4529302091.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/69937401630.pdfIn PDF document text
    • http://xajuvezovaguze.rf.gd/87019055038.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_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 5124 bytes
SHA-256: 5f4cca24a108527435ec798cbe1291026938c47007e065814776a3a5b2e1a3a2
font_01_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 10452 bytes
SHA-256: c0f351be90af00933aa09ad27028da0a98167d55f6002e2ea70283fae325ead3

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