Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f580a82bc6ff47b…

MALICIOUS

PDF

80.2 KB Created: 2020-12-29 22:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e88252689acafd7ae417101711715d5 SHA-1: db59931dc5f00b19d59294313f5e76c2b89b7288 SHA-256: 0f580a82bc6ff47b2f0dc7ad5c615c84b10feb93b6bb935dc3106c79eb4f3ff5
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 pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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/strik?utm_term=confined+space+risk+management+plan
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/tofipumovogunobon.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5fc2f500e5100.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/4518447.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/fibojumimat-zukukojazasa-zitirire.pdf
    • https://nitetemefugek.weebly.com/uploads/1/3/4/7/134772401/763ca8f05f7ca2.pdf
    • https://ratemalopez.weebly.com/uploads/1/3/4/7/134753477/salamitelenigomu.pdf
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fdea5e9b7b34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vexeliku/fun_campfire_songs_ukulele.pdf
    • https://uploads.strikinglycdn.com/files/5eeca4ae-aec4-4e14-8f83-3efbb57d605f/lakevimosufidezarabobubis.pdf
    • https://s3.amazonaws.com/zirojopemup/fusion_documents_en_ligne.pdf
    • https://uploads.strikinglycdn.com/files/da1c0483-4129-4409-8a42-974dd5f87dbb/95141632648.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin
fbd4ed6d6fe85f88175ae5e4d218855b3c29b2ff57549ab540a6cd91649b5950		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5348 bytes
font_01_sfnt_off00010212.bin
aaf74412f88128952dc137bfb9ff4ee8ab098a6d748774da3bede7528f68ee10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10544 bytes
font_02_sfnt_off000125c4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 4324 bytes

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