Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd73eefeb486e9e…

MALICIOUS

PDF

67.5 KB Created: 2020-12-15 05:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9fe5905c817e256566fda6e7946b5f SHA-1: 9e175f18e35ddb84e719809da72dc52701b85999 SHA-256: 4cd73eefeb486e9e0da5c694eaea0c5d8571227e551eedc9c8598222e7f286b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to external resources, possibly for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=funnyhouse+of+a+negro+pdf
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/1591f88618bf68.pdf
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fa43c574cbc3.pdf
    • https://cdn-cms.f-static.net/uploads/4401546/normal_5f96c1946e1e4.pdf
    • https://mefapepuj.weebly.com/uploads/1/3/4/3/134310437/96478.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_5faef4b8761ef.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f96026e1122f.pdf
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5fd3d17379092.pdf
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f9451bdbafcc.pdf
    • https://cdn-cms.f-static.net/uploads/4482631/normal_5fd33a336e24a.pdf
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/6574760.pdf
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/tifima.pdf
    • https://puvemeximaz.weebly.com/uploads/1/3/4/4/134442093/078b9d28ed.pdf
    • https://cdn-cms.f-static.net/uploads/4503584/normal_5fb341c43ee13.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/werizoredizisoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dudujopixejikug/30696015618.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_off0000cbd3.bin
805ff1c97edebfeb3eb71b0ac7c22adbe9e7a6f7db08edb088c8152aec58edc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 5328 bytes
font_01_sfnt_off0000de00.bin
264f4bc5cffa208ac9e223849ef3da6659a7e137562a0eb637219696d63bac2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10384 bytes