Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c11c67b5f1a7eeb…

MALICIOUS

PDF

74.0 KB Created: 2020-12-31 01:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86cdfecc0a80b5f9d68791523c0ee13 SHA-1: 7863ed51156542e9bc8738b80890d4432488b730 SHA-256: 6c11c67b5f1a7eeb6f4fc42e7f30d215b59035b3c2880d12e53b9308115dffe9
156 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 of which point to Weebly-hosted PDFs, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to the external URI, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=nasal+polyps+cause+snoring
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/wexoderisinewonefado.pdf
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/17455.pdf
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/3685207.pdf
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/cc132.pdf
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8fca5fc548e.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/6325624.pdf
    • https://cdn-cms.f-static.net/uploads/4476758/normal_5fbe918c6732b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/autonomous_ground_vehicles.pdf
    • https://s3.amazonaws.com/dogazisuze/rubamofosewirin.pdf
    • https://s3.amazonaws.com/tunenijexe/riwigukerafadafelidinufov.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/bole_chudiya_song_pagalworld.pdf
    • https://s3.amazonaws.com/regufojalojaza/walmart_swot_analysis_2020.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_off0000e697.bin
8cec77494615c9bf06d7d2cea9ed4d6c516e51ad7a95457b31502f5bd75f0b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 5172 bytes
font_01_sfnt_off0000f84f.bin
53af48c7742f9137c010e66ff5da5deed1fc88868294d1ceb98ec5b915abd034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10164 bytes

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