Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3247942d36bf5ee…

MALICIOUS

PDF

68.0 KB Created: 2020-12-16 19:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fbca0a1efbdb02e48fc12940fce9303 SHA-1: d6d29aee35717a1294656796be611d1f62f35058 SHA-256: f3247942d36bf5ee81d415fb7404aa0e2dcf048fc505318c2f633ac38059f297
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure and link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests the document is designed to host numerous external links, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=rheem+electric+tankless+water+heater+troubleshooting
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/2662764.pdf
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/40dbc267539ec80.pdf
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/d9ed0dfa184.pdf
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fc7249202f1d.pdf
    • https://kigixefowu.weebly.com/uploads/1/3/4/4/134496532/zigumakomiwoz_jusevuj_pizunilabufel.pdf
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/2357003.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fad9227e291f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc710ac6879d031da0ff387/t/5fd6ee857fc52c20693958c6/1607921286915/ncert_books_ka_full_form.pdf
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc1fe8df3de5e49b5aae37e/1606549133603/dusafawudozugolavunotof.pdf
    • https://s3.amazonaws.com/zevutebulaworel/aduro_9-_3_manual.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6230fa04221c71180b80/1606378034210/11533807348.pdf
    • https://static1.squarespace.com/static/5fc57a2a1452f90b7f03fee5/t/5fcb209c1df7590d80dadf9d/1607147686279/fumejobufumenesujab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd33.bin
72c45f6ba88db22e83a8f8c7de4c78536de42af75c5acb1632aede4757b282f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 5516 bytes
font_01_sfnt_off0000dfe2.bin
f23adf283866faa12b8a3954e453832b6896eb4df608c60c8c9bf661b50d9745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 10280 bytes

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