Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdb956110cdf015…

MALICIOUS

PDF

137.2 KB Created: 2020-12-29 20:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 668f0b07d69b359af64600f1293e4ae6 SHA-1: 112b479bec3d6573107f6c45adda7b26b02c1ed7 SHA-256: fbdb956110cdf015640a13c939cc06ad135b02b9596efd5b887a22e5b1b3beb8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential redirection to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://traffine.ru/strik?utm_term=getting+to+mars+and+back PDF link annotation
    • https://lokabema.weebly.com/uploads/1/3/4/1/134109183/jupina.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/53b735.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/6564223.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/zeraluti-kavebemumofer.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/512489.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/62ef76e1176b55d.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/mamukawaxatali/zivimarupozezukizelitirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b169a2bf-9eae-48ee-9950-266322d77f4b/skyrim_carlotta_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/4033571479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43b9c9d-22f8-4fb1-8696-d5feecd43335/wubikizotivime.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/tazuse.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_off0001b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2EB 10576 bytes
SHA-256: 9f48c844fde1a4e2c782d9df81254299fb246ee7d7c3d677f5b9e4b112bba7c6
font_01_sfnt_off0001d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5B7 5460 bytes
SHA-256: dc753635c003fa9b0fe290dac52dee0fac3f5eb93755dcda991beb87c9a2a9f0
font_02_sfnt_off0001e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E836 14768 bytes
SHA-256: fd625927048e3162549628c4d7b845bb7df47c55f0d37f1c8e382362bdda0eb7

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