Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d4585a3565fe62…

MALICIOUS

PDF

71.4 KB Created: 2020-12-22 03:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298ddd749ea68fd198f8d78d69ae25d2 SHA-1: d6fe8d0bced5c55fd8d85ffe02ce31c003a3227d SHA-256: 38d4585a3565fe6265c266ffb1b89028fa4ab684190cab5c59a87fe8434fc3cb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI that directs users to a suspicious URL, likely to host further malicious content or phishing pages. The PDF's structure also suggests it's part of a link farm designed to improve SEO for malicious sites.

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://traffset.ru/strik?utm_term=prison+break+tem+na+netflix+2020
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f8eed287e0ba.pdf
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fa41e89f0ce1.pdf
    • https://bugitepekasi.weebly.com/uploads/1/3/4/6/134669175/tafur_nesap_pizepepikovubex_midegixugog.pdf
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5f9d7372dfa36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/681d10a6-55c4-4df7-ba9f-0a0739096ab4/61303036506.pdf
    • https://uploads.strikinglycdn.com/files/27808973-eed9-4af5-a16d-f301264744b1/girl_with_the_pearl_earring_painting.pdf
    • https://s3.amazonaws.com/wizedumi/theories_of_deviance.pdf
    • https://s3.amazonaws.com/pogolo/nature_background_hd_pictures.pdf
    • https://s3.amazonaws.com/luborinizu/vizosaru.pdf
    • https://s3.amazonaws.com/woxotopapozokev/kufiretunud.pdf
    • https://uploads.strikinglycdn.com/files/c866568d-36e2-4a3d-8ad5-ea0be4cea97a/xonomovitijewida.pdf
    • https://s3.amazonaws.com/xefezesebusu/trend_micro_antivirus_mac.pdf
    • https://s3.amazonaws.com/vavabi/trig_functions_graph_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d2.bin
617a6c43465eba2638e74576660c7a10050ffcfd2e383ee03fca82f76d349033
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 5248 bytes
font_01_sfnt_off0000db86.bin
fec534191aa518917a640ae8df813ad6777b4239135381d0dc21940f23c5dae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 11656 bytes
font_02_sfnt_off0001029d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 4324 bytes