Malicious PDF — malware analysis report

Static analysis result for SHA-256 31185f569b6ff085…

MALICIOUS

PDF

61.1 KB Created: 2020-11-23 16:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 495c683424952b302348c898d631d7e0 SHA-1: 2cf64290e2c5075871fbe64b0fa45b0fb5766528 SHA-256: 31185f569b6ff085ac532735074da092ea1e962f302b5615403a4fdc8139a022
136 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass security filters. The embedded URL points to a suspicious domain, likely hosting the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?utm_term=libro+de+enfermeria+nic+descargar+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5fbb19efee553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f914eb21f1d7.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/dbbf572f9.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/wupeditefafefezek.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vidabudivodeduwokobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befarekogol/assured_shorthold_tenancy_agreement_uk_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/medevimiwuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/87911828725.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_off0000b105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 5388 bytes
SHA-256: 67b85231ad7610f144202091023e64375dd9c0291b0ac7193f83ebcaed7baff5
font_01_sfnt_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 10564 bytes
SHA-256: 964eb0725414a7b9d03b4115280c537b1484bc88e0103d7d2d2bdfe6de9110b4