Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8496cffd74a6b0…

MALICIOUS

PDF

68.8 KB Created: 2020-12-19 16:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 53d29c7c618e5c77a929691d1c1abac6 SHA-1: bd1627b30b3b8f963d16f90d74f41fdaa434cbe0 SHA-256: 9b8496cffd74a6b00c6a7a0a764e430815b3345bcd9b08975085eab37318bc42
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafficel.ru', which is likely the primary distribution point for a malicious payload or phishing page. Although no scripts were directly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit the user's trust by presenting a seemingly legitimate document.

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://trafficel.ru/aws?utm_term=mt8870+dtmf+decoder+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5fc12d4fb92bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f88db40160fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_5fa81ab67dd1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5faa06d21e235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5fd823b3a9aa3.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/f4353cdc-75cb-4372-8287-def88d01b61c/70991453316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cedcc4-debc-4ab6-a636-7edc70bb626a/hasclass_jquery_classes_mltiplas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66b1c3398ff7515537f6c/t/5fd1e6bceeaf2774ac8fcd32/1607591615291/my_verizon_app_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/beau_pere_movie_1981.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/dedusezojuwixedik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3c7d43-a745-44c2-ab93-98577f03dc2f/chuck_season_3_episode_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5ada29-bc6b-45c7-bd32-fbeeab8fa0de/tapalewuxo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc557cb3398ff75154b585a/t/5fcc2ef30ab5d62febe393d5/1607216883737/bsnl_mobile_recharge_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0c17f4-7db7-40a6-9bea-e4beb5070d3b/nofufadetuxuzazimid.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_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 5648 bytes
SHA-256: dad1dde72cf748bd2a55af921620f08a507e478a898aad3816ac29ce87347038
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 12568 bytes
SHA-256: 4fb189abd723f019f13c07e3c8ef20938a657f2ef2925f5e984d40015f1a2e4b

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