Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe3ecdb7f079e3…

MALICIOUS

PDF

71.7 KB Created: 2021-01-29 06:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8e792159931fd42f4f3f220e033946ec SHA-1: f03709ebf441aa93a8f5556a59ab2488d0e8a5f2 SHA-256: bcfe3ecdb7f079e3143915d7362037b7ecd834b852ab50dd5382854eb0dca51d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=what+is+power+set+in+python PDF link annotation
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/vuruj_xirep_koxide.pdfIn PDF document text
    • http://remastacer.com/mobile_money_business_plan6l3il.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/7681890.pdfIn PDF document text
    • http://fruktovik.com/luruxozornvy0.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/tolasubokomosumip.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/fjegjhU/tiktok_stock_ipo_date.pdfIn PDF document text
    • http://sks-expertiza.ru/call_shop_management_center5zyjc.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/cKxTgcX/fojoxizusavunudimido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/loneminovu/9549331432.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/bangla_natok_420_all_part.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/citicoline_mechanism_of_action.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/sesovoburigaberigumaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/creative_writing_exercises_for_adults.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 4868 bytes
SHA-256: c965e5b60484427ec50a1066dd73ac4f6b8f6aae4ce95ad775894aae614b7af7
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 11372 bytes
SHA-256: f6d55c0085a2c1b539e1b6fe18b6fea168c62173f0973aac949969fda1401a24
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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