Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0d77cd521e7b38…

MALICIOUS

PDF

67.8 KB Created: 2020-12-18 21:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6ffa071ee24831cea2885cc622df7749 SHA-1: ab34fd94710812455e7c26f88838195ff69ff329 SHA-256: 8a0d77cd521e7b38af3da297d82d891b217b2f3e710fdb7e888e756f906c4753
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is highly suspicious. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=periodic+table+nys+regents PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fafe044a1d93.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/buwafudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450731/normal_5fc530a59b59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f9a608b68ad5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2febc3-cb36-4227-8280-ea4dc67a8f4c/56248310325.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/harp_seal_facts_and_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7034d7-395f-4b4e-8328-e48dbf91f98e/kodok.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/796877076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92a2166-8a1b-4ff1-bb89-e536533846ba/ejercicios_de_acentuacion_primaria.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cc8f9d43d906ac099289/t/5fc934b6977dcb12c0486930/1607021751160/wubowatukutedetotetiva.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2a4be18c5c478ec56389/1606298188582/transfer_tickets_on_ticketmaster.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 5348 bytes
SHA-256: e13a44714ce48a146987cb0b55c08ff3787afa757aa1f848748c9c5425c3f449
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10428 bytes
SHA-256: 1b85396e0ae65a79ea55f5f88a879eb33b19d5efdac010ba60a17cbfa9201583