Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57d2b31d9cee9e6…

MALICIOUS

PDF

77.0 KB Created: 2020-12-29 12:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b900e3cfe48f3a08b46dea01d0a1b196 SHA-1: eaf7d902a0c1c66ef86d4398a2af0f7f464b54f1 SHA-256: b57d2b31d9cee9e64c270ce3b4d8b10a52461bfd9cdd31757e83dad8e451f427
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 that mimics a search engine result, likely to trick the user into visiting a malicious site. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of a phishing attempt.

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=yellow+pages+phone+number+search+south+africa
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fe9088b3f6ac.pdf
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fd039ea9ed9a.pdf
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6960432.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fe8201a56c71.pdf
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fadd404b4a98.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5fab74c51ba34.pdf
    • https://pesawesezopi.weebly.com/uploads/1/3/4/3/134327800/7d0a10de8e4b2.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/karurukunuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/33630fcd-d023-4d54-9fa1-4e95623f2c29/fijozivukunodifusuxiwezil.pdf
    • https://uploads.strikinglycdn.com/files/aa65684f-09ee-4181-9b7b-4b47591bd806/avid_trf_form_2019_example.pdf
    • https://uploads.strikinglycdn.com/files/a47768be-2f54-49f2-8132-0fba4ff14110/22859860776.pdf
    • https://uploads.strikinglycdn.com/files/7223ba98-34be-4c36-9d3d-f2e2e713d2c7/detroit_massage_us_sex_guide.pdf
    • https://uploads.strikinglycdn.com/files/7efc761a-53e8-4e14-ab31-180b40732814/police_and_robbers.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_off0000df3f.bin
cf44e735db97db1810265759ae80e30019492581847f15257f7c475f0580cc2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5504 bytes
font_01_sfnt_off0000f1da.bin
621a9704d661f334f493076bce8e225feaffbcc65c3657332e1e130753bd6177
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 10904 bytes
font_02_sfnt_off00011728.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 4324 bytes