Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd7c24591e06f7b…

MALICIOUS

PDF

76.2 KB Created: 2021-01-07 22:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 84fb6d088dc3d3860b38bc15c5abec38 SHA-1: 767bb6a0adc9c6aa90e6a81593af2968f7029117 SHA-256: 8bd7c24591e06f7b0bd4018512b8cd01ab78b0f7ec2171cda2bfb4a8ac260fa5
96 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a theme related to Android OBD2 apps, likely a pretext to drive users to the malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafftec.ru/aws?utm_term=android+obd2+app+usb PDF link annotation
    • https://cdn.sqhk.co/tokititagiwe/ifMwKpk/vertigo_remedies_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/ajeibhf/xajopemelipet.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/hebhjhh/tifajefuder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5fa9bafce8682.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/jtnjbhh/oddmar_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/hijhjgI/hide_and_seek_io.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/jgjijgK/benulerime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ba316376-c28f-47bb-ad31-943a29aea1a3/95923538459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6345e3e-3a74-49c7-9c76-5fd3d2241472/76635824172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c15f8f-158f-4614-b12b-d7d750d4ce4b/muzofaniledo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 4868 bytes
SHA-256: 1a16ba7f18529e6b7d50c79e22aeac2add2a969be92c537da58e1c5937b57ff1
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 11072 bytes
SHA-256: cfc80be6bb9724c13ce0b08981b9f82505f77563db2462d3d6847047b611b307
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378