Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b394e543fd76801…

MALICIOUS

PDF

69.2 KB Created: 2020-11-16 22:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f629479f4320d8180bd4d051a7ef2158 SHA-1: b9b8a24a2be193600c91893362c6cee6fbaa206d SHA-256: 7b394e543fd76801b82d8eef43cbd23e3dea54802c87858728816f4e210cd72c
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 pointing to Weebly-hosted PDFs, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=transcription+and+translation+quiz+answer+key
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/lifise_kamujojekal_setakafonevawib_leliledud.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f94b5b676c55.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8720a992d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f8fd8d712dcf.pdf
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/3810150.pdf
    • https://komolelavox.weebly.com/uploads/1/3/4/5/134518501/4169842.pdf
    • https://kijudizi.weebly.com/uploads/1/3/4/3/134321523/fegufifen_dugagokelu_papanake.pdf
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5f90e3ae93c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4462035/normal_5fa30437a05cc.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f878e4c9d84f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zoromexemuzid/amusement_events_and_recreation_award_2010.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_off0000c463.bin
53a3ac058046362f32958d914827982c66476b8b8bd83135d3d2e838d563db62
pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 5332 bytes
font_01_sfnt_off0000d6a1.bin
2f0b7043bd9f3d9fedb312d16ab507f66b3dc3d6f054346027da66485393925e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 10456 bytes
font_02_sfnt_off0000fa13.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 4324 bytes