Malicious PDF — malware analysis report

Static analysis result for SHA-256 935fc0167a0526c8…

MALICIOUS

PDF

84.0 KB Created: 2020-11-25 08:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4d5e4bdcdc1927010fc087ab104fbb SHA-1: 6bdd4abdad79e7d2bf20dd7b479b05ca8c05835b SHA-256: 935fc0167a0526c8cd1abf0c2330de13877b01ddedde71b9014e1e52d903574a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to 'trafffi.ru', which is likely part of a phishing campaign or a distribution point for further malicious content. The PDF structure and embedded artifacts suggest it's designed to exploit vulnerabilities or trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=cadmium+yellow+pale+watercolor+substitute
    • https://lizuvozirowamu.weebly.com/uploads/1/3/4/7/134719338/14840.pdf
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/7cf522e.pdf
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fb5b3ba57309.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/rizizovidonaxa.pdf
    • https://vunemagerubu.weebly.com/uploads/1/3/4/5/134525741/popozo_xofijekibab_turexufuzodam.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/fedug.pdf
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bcb69700-b856-43f1-bbd1-d3520194f7bf/junoximolinogefep.pdf
    • https://uploads.strikinglycdn.com/files/9ad21aae-70ee-4186-ab3a-b2f94a5460ed/95158661442.pdf
    • https://uploads.strikinglycdn.com/files/d77545d3-272c-44a5-a878-8e14480a4e4a/sopadijaxemudufebimafofo.pdf
    • https://s3.amazonaws.com/fosawef/words_with_dge_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/4b53eed4-61cb-4074-a13c-22e0efa9f9dd/44769076691.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_off000109bb.bin
9fa391e00fc3d90bfc4d9d38afa5c633658e33051a1f2bc1ff867eb725d29783
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 5460 bytes
font_01_sfnt_off00011c42.bin
59e2d1bed6b431757591b7048cb26d72f0b282bdcca779d93c4899ab34d30f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 11596 bytes