Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadd42115e34df04…

MALICIOUS

PDF

66.6 KB Created: 2020-11-28 18:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc648e9c364275d411d33489f5b271b SHA-1: 78ab8d069150da5fea33ab37f76d705a74715500 SHA-256: fadd42115e34df0478831e1869d7d7e7cba840d6d30a5ddf5358d5e299c38856
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, indicative of a link farm or SEO poisoning attack. One of the primary external links is to 'trafffi.ru', suggesting a potential redirection to malicious content or phishing sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest an attempt to direct users to malicious web content.

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/123?utm_term=phoebus+dwarf+fortress+0.44.12
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/1432210.pdf
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/d472652aeb0cbaf.pdf
    • https://cdn-cms.f-static.net/uploads/4471092/normal_5fb25babea52e.pdf
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/mipamafazomoguw.pdf
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fc1e309abc88.pdf
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5f9c5ee67f0ee.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/poxaz.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fa82bb58341d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/48826e54-3c47-4fd2-9079-2063f8e638e8/doxunivafax.pdf
    • https://uploads.strikinglycdn.com/files/99a33e7e-3a3f-4339-acde-8528bc7c3349/96296355109.pdf
    • https://uploads.strikinglycdn.com/files/212975c2-c651-4d2e-beaf-7838e346ac32/jejojo.pdf
    • https://s3.amazonaws.com/dejazuvorira/fineliroribofisidugu.pdf
    • https://s3.amazonaws.com/daraniwekamidir/mubiwikafa.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_off0000bf4c.bin
3ced66b2c387f1d0b8c0a7638270a079cf5fbe004d3b8f12aa2266fd6aca54df
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 5640 bytes
font_01_sfnt_off0000d296.bin
ab6eedd49be69621e7059441de2db13fe5be6ae058133e85d504a525bc946b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 13344 bytes