Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c6acbb8ab1d6a7…

MALICIOUS

PDF

84.9 KB Created: 2020-11-11 22:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3873244de9890a81ef1548e025dd6d77 SHA-1: df0a7bcaa516d368f880c972bb4adc6179fa3d10 SHA-256: f7c6acbb8ab1d6a7757bdf6def76fddca131843edc9e4f8d1f7dfa6dfa76dfc3
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URL suggests an attempt to trick the user into downloading a malicious file by posing as a legitimate software offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=comodo+antivirus+apk+free
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f9e8339b75ab.pdf
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f9260df17b16.pdf
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5fa4bbd9e9dae.pdf
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fa2e84d58c97.pdf
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f87828e729b7.pdf
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5f91e376bc607.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fa481d910c74.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5fa8f519ad567.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fa00c03efe52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejawiwomak/word_plexers_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/e0a0dc04-582a-4302-ad73-8bb14f423134/64002076091.pdf
    • https://uploads.strikinglycdn.com/files/dcfac06a-0926-4078-828f-6dddd6107d11/latimaxajadavezesojudib.pdf
    • https://uploads.strikinglycdn.com/files/17426ef7-ec32-4d8e-8e81-da80d19fcd25/65265961061.pdf
    • https://uploads.strikinglycdn.com/files/79904bed-ab45-456e-baa6-69e4b6b6fed0/tobelusiguni.pdf
    • https://uploads.strikinglycdn.com/files/208ebecd-f798-444c-9f4a-02599cc4832d/english_language_and_composition_section_1_answers_2012.pdf
    • https://uploads.strikinglycdn.com/files/1e807e38-608f-4f0a-8f77-d5ae400863f1/30361259200.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_off00011004.bin
237c4b00c27511adbd296f77ccda450465cc4cbe4a3d13a7c9f1357b8e1e3b18
pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 5184 bytes
font_01_sfnt_off00012199.bin
6486ee1ca91cde323b98e0e3c3b86bf601a6cb29f6505330d26d5694ede06359
pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 10860 bytes