Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea55c9adb35bd91c…

MALICIOUS

PDF

87.4 KB Created: 2020-11-13 06:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d8d51ab6ee0199e5f696e713a0fc006e SHA-1: 7c136ffef4c9d7ca7654d15a56c4f35caab8169b SHA-256: ea55c9adb35bd91cf6e34d481f09bc3bb6759c89acdd25a5a5f2a55b1ecc0ba4
96 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 as a phishing trojan. The embedded URL points to a suspicious domain, likely serving as a lure for the user to download further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=daiichi+navigasyon+yaz%25C4%25B1l%25C4%25B1m%25C4%25B1+indir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454545/normal_5fa198389bb72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_5fa76de74d7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f912456d0ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f97246b80643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f92a56c483c0.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/613942d8-0eaa-47ad-a815-6ebc68ab10e3/brushless_dc_motor_construction_and_working.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/oxford_phonics_world_4_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/creme_fraiche_publix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c31d89-678f-440d-9ca3-9798257518cf/gta_vice_city_polis_modu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da991c32-b4c9-4a0c-827d-d372558f5b78/29789732716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5a69e8-522d-4127-847c-cff53150cc4d/vimotakuwosazesobipotage.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_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 5596 bytes
SHA-256: a2d5cd90f3460ed75e421af078189e57486a2e377c46d9556a06b4497d84d49d
font_01_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 13128 bytes
SHA-256: 030725a95974bfe78662781d78b764d60b8cab4cb5399907a40da03e2769f113