Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28c7733545e8b9f…

MALICIOUS

PDF

69.7 KB Created: 2021-03-04 03:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1f853615c68a935821423f7d01efc64e SHA-1: 394de51359cf6263c64f495e375c8297497363b4 SHA-256: f28c7733545e8b9f1fa5bdccd8d4ecced7ed968639fb04f5c4c974fe0d340917
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The primary URL, 'https://vilenefex.ru/strik?utm_term=attack+on+titan+live+action+full+movie+eng+sub+part+1', suggests a lure related to popular media to entice clicks. ClamAV and ML classifiers strongly indicate malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=attack+on+titan+live+action+full+movie+eng+sub+part+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd7261cd54e8.pdfIn PDF document text
    • http://pomirkapa.site/fruit_nut_slice_gluten_freehcls2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_5fd99758dcd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fd3770bdc110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_602f0913f00a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_602742b8ab0b3.pdfIn PDF document text
    • http://kneeksi.ru/89348375494ls8a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403270/normal_5ff4ce73684e2.pdfIn PDF document text
    • http://fomizedo.iblogger.org/90306096386.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/sosozixesejipilokeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5ff846538ac7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6039fa813718f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipiwafupogo.epizy.com/3rd_grade_math_worksheets_mixed_review.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/change_email_password_android_outlook.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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 5640 bytes
SHA-256: 4b017dc3af0d1b0ea239fd80b19c1a53c4d6d6d50f900b9ebb7f17228a51bb81
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 10952 bytes
SHA-256: c356c257ff3601144cb870c87c132158b445ba995a07823b7290a57d704cb9ee

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