Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bc4807d2704051…

MALICIOUS

PDF

70.4 KB Created: 2020-11-30 20:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0e1398408ee6d730a3265a5064303395 SHA-1: 34a29f7c9dff515f808f43a6b45a2957ed335fb5 SHA-256: 07bc4807d2704051b304a19528978e4d1372d7a8464137f28fb8d0154860dcb2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to be junk data, but the presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content.

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://traffset.ru/123?utm_term=bulova+precisionist+watch+black PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8a51e1700c6.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/pezupoxuve_pusadi_xivepoverun.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/rudorodi-lotufaku-volosubedukipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f956aa4b3077.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/jekuzotatuduz_ripaza_lesufusezij_tujife.pdfIn PDF document text
    • https://ginorafixane.weebly.com/uploads/1/3/4/7/134722580/rapamitutu.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/wilobexenabore_pagiro_rujiputevozipik_wubaj.pdfIn PDF document text
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/wojaripisuvapav_kanogu_godazivazorapud_dasox.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/jawuxovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1dda692c50b1a1e7e4a1d/t/5fc511a2e18c5c478e9b92ec/1606750632429/52043794625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4b4b3d-9567-46d7-810d-bc73a1e33624/fridge_freezer_combo_wattage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0970a1-909c-43c5-961f-a4a2ce2d0104/49782480324.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/wedogogakozojepebivovepap.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 5424 bytes
SHA-256: a5d08b121efdcb04c2fdf57bab8b3279cd04bbfbc48e1c0f37c3562cad000794
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 11052 bytes
SHA-256: 36596c619239042903d25c3b7840d04b4d03d263f71bb9947e3c55364823fa17

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