Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5609398512b96c4…

MALICIOUS

PDF

65.9 KB Created: 2020-12-15 18:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc733ae4860cb4ae4ff6267eb3e1704 SHA-1: 5d228f7eeaee3784698ffd5506e46513f7ff5a00 SHA-256: c5609398512b96c4b6d2ad4082ea3ca42edcc5e1a57fc1f58f61e397a8a8bf8f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is trafffi.ru, which is likely used to host or redirect to malicious 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-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://trafffi.ru/123?utm_term=employee+self+evaluation+format
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/2053559.pdf
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fa7912019223.pdf
    • https://cdn-cms.f-static.net/uploads/4452865/normal_5fab9cf3b837d.pdf
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/8e7eb7bab37f8e7.pdf
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/bediluritu.pdf
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/develesi.pdf
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/xajigumosez-gasop.pdf
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/608984e10dfac30.pdf
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/d537ea40ab.pdf
    • https://pulepuvoko.weebly.com/uploads/1/3/4/2/134266128/8039263.pdf
    • https://jubuxazule.weebly.com/uploads/1/3/4/5/134585976/3581005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec271ad7-767c-459e-95ae-38de7f0f92e2/wijidazitu.pdf
    • https://uploads.strikinglycdn.com/files/e67448b6-6dd8-4e32-a709-680429433b1f/silojurerugesovoxiwiduv.pdf
    • https://uploads.strikinglycdn.com/files/30a09d75-7790-4b59-9ab4-c49c81ef4991/69001874131.pdf
    • https://uploads.strikinglycdn.com/files/4b48b8d8-fa63-4744-986c-ce018da5a042/mirusamarovajixamolaviwu.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_off0000c875.bin
3066faae2174d5f26ffc30d0d200921161d324b8c0cf2c98216cb1a83d0ff000
pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 5164 bytes
font_01_sfnt_off0000da05.bin
4fed52439ad292fc69dd0ddfc6f9cdd2e7838572418f8808552be7159cac085c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 9584 bytes