Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5f9c69a37777cf…

MALICIOUS

PDF

71.5 KB Created: 2020-12-25 21:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94ab88487c3c34bfe434ab2560c2949a SHA-1: f42763eb591026ba537f8528c472e01804a7f3dd SHA-256: 7a5f9c69a37777cfdd2deb553feeb99f3aaaa91d628461f1d5f8b26c7131bff3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=banvie+car+alarm+installation+manual PDF link annotation
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/mapuduxebusif.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/8788357.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/1486475.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/45142ca75d.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/e7134dfd.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/dugizatejo.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/0d29f0034157.pdfIn PDF document text
    • https://kazagito.weebly.com/uploads/1/3/4/6/134665665/91326d5dd.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/4484916.pdfIn PDF document text
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/rabujet.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/d6a416d8242e.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/32dfdfd7-e191-4ba2-a615-fcc72060875e/lego_star_wars_slave_1_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe0b0a5-fcdc-45e7-8f2d-ee4ea5b8ecb7/wafebufamitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/60372330850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955aef63-4c7f-4ef6-9d51-6fed8ce0162d/19427729067.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 5052 bytes
SHA-256: ea9acec0eff8fb4ac91771f349552d666b17c880ccfeebc26bd230b8a23bedf4
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 10324 bytes
SHA-256: 725365984f4daad1357899af1245a0d692e73fae3b15e6676c26159208cec6bb

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