Malicious PDF — malware analysis report

Static analysis result for SHA-256 4078e5f441dec894…

MALICIOUS

PDF

72.1 KB Created: 2020-12-24 13:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06eb56ba7e8a5aef9f5da9718310e6fe SHA-1: bcba7609891998603033daa48b8473cefffbb5a2 SHA-256: 4078e5f441dec894c39fe796aaaed264128963d782ff0af6c7c2322c6b380fb8
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 potentially malicious or spam websites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to a link farm or phishing site, likely delivered via spearphishing.

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://trafftec.ru/strik?utm_term=pink+pencil+skirt+outfit+ideas
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/b68733920eb9.pdf
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/xusadedef-gilowulojasedu-pajewika.pdf
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/5740eafe840.pdf
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/mitiveliborixemosom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f70f970b-c06d-46dc-bf05-fbec0154f2b9/motedokefebubogokegi.pdf
    • https://s3.amazonaws.com/pusori/paponutuzenamulobebe.pdf
    • https://s3.amazonaws.com/fatisake/2385270616.pdf
    • https://s3.amazonaws.com/wilugugo/12472801631.pdf
    • https://uploads.strikinglycdn.com/files/06ed1ccc-5b85-49d9-b9bf-3156b9bf9f78/41224804600.pdf
    • https://s3.amazonaws.com/sajatesawodiji/bikonedelelifojojujas.pdf
    • https://s3.amazonaws.com/levovod/64271107481.pdf
    • https://uploads.strikinglycdn.com/files/4c42adb0-24f6-468f-8f03-d9b236d3c555/ipod_mini_manual.pdf
    • https://s3.amazonaws.com/jaloto/midivilib.pdf
    • https://s3.amazonaws.com/vinivuxo/fire_burn_dem_remix.pdf
    • https://uploads.strikinglycdn.com/files/b14ecba9-59df-4a12-b4f7-1683c08d98e0/noxurafiro.pdf
    • https://s3.amazonaws.com/bipovoromoj/80425812365.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_off0000dea0.bin
48ae5a5d07e9f6de91003b049556a836b5a507762d6a77d18fec05043ea56b91
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 5212 bytes
font_01_sfnt_off0000f06e.bin
d4e2c802b3308d538867b28774ca42a1ced0fe31acd6240ea597cf906b34e63a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10268 bytes