Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d004d55bf86cf66…

MALICIOUS

PDF

83.7 KB Created: 2020-12-26 16:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7832c2fd7c9946c383d5bc3d393dd0df SHA-1: 18f4f22ab2678c652595e51ee3eb303f63544989 SHA-256: 6d004d55bf86cf662a683a16f935a83f4a4424615868b1a1755198c82d5971fe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support this assessment.

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://trafftec.ru/strik?utm_term=infectious+disease+specialist+staten+island+ny PDF link annotation
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/9992835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_5fa9c27f9c3ec.pdfIn PDF document text
    • https://wapunukipebew.weebly.com/uploads/1/3/4/4/134440940/1d6b09c.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/putubomutizona.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/5721251.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/ihhhnii/26806952381.pdfIn PDF document text
    • https://razemifutibedur.weebly.com/uploads/1/3/4/4/134431978/sagede-nojeda.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/faduge.pdfIn PDF document text
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/77158d318cd8731.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/f6701dea2b.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/6927457.pdfIn PDF document text
    • https://basubuliwude.weebly.com/uploads/1/3/4/7/134729102/9922395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 5092 bytes
SHA-256: 141b2e3488b7134ad8c9deb9bab13363319571d3f539c4905f05793b261dbe47
font_01_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 11816 bytes
SHA-256: 975987e7f9869edf12e707a21c987a8a4de8fd5de28180e6cec077e0ba205c6c

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