Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe95f4d3872885…

MALICIOUS

PDF

59.9 KB Created: 2020-12-23 09:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94f3bc23a9de7ebfe5e9a52a85fa9305 SHA-1: 176789e2b901ecdfe6b2d72fdd6c2e1990bfcb37 SHA-256: 8efe95f4d38728850822d87d73f1f996995c3543cc1b7f86749f7346d15c87e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated content, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=gameboy+sp+games+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5fe18e68647f7.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/1511568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fdf30bea0161.pdfIn PDF document text
    • https://kusumuwuwudes.weebly.com/uploads/1/3/4/3/134338751/gezagujixoj.pdfIn PDF document text
    • https://xobijetulotifo.weebly.com/uploads/1/3/4/2/134234675/zilanigop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/029c236e-8488-4405-9e67-2a5e19084454/63686090012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438e02c6-5778-4d70-90aa-a15e3e812cd6/83758729366.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/airline_ticket_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/90019326763.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/consumer_reports_mattresses_ratings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07737937-2540-45ad-8115-cf96b3cf2d2d/tipos_de_fichas_tecnicas.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/chitrakala_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/jagusuxulikigif.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_off0000ac49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 5496 bytes
SHA-256: 38e8b4c33a0e0b6371292d2732c3676234bbfadd33c91fa33fb2374d124ee7ce
font_01_sfnt_off0000beef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 10812 bytes
SHA-256: d7039942dc798d8b52f1b67548bedfc68d855dc0671c1144d858f9bdb1838b2f

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