Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee90116cadd9ef3…

MALICIOUS

PDF

67.7 KB Created: 2020-11-21 01:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd8f26bf76cad7b3207143fde04a722c SHA-1: 559690f6af45488987dc467f0daf500ce3a78bb9 SHA-256: 0ee90116cadd9ef383c242eb58f8a6eff40f1f53b762de23c8dc533d0f9d2a3d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one pointing to a suspicious domain ('trafficel.ru') that is likely part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=r9k+twitch+%25D1%2587%25D1%2582%25D0%25BE+%25D1%258D%25D1%2582%25D0%25BE
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/1150966.pdf
    • https://gafixipen.weebly.com/uploads/1/3/4/4/134444756/pugolavotaf-bisobudon-zuzedimib-jerafa.pdf
    • https://toviwapomini.weebly.com/uploads/1/3/4/7/134727984/d7f01d5718f.pdf
    • https://pepowogipiwud.weebly.com/uploads/1/3/4/3/134344034/tazewube_rosojora.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/695d0481e.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5fafe22992634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8443c56c-f7f5-4f1e-99a2-5a30c61eaa00/59761040611.pdf
    • https://uploads.strikinglycdn.com/files/52b110ca-b4cf-4f73-96b9-9d8925f5b186/9143271551.pdf
    • https://uploads.strikinglycdn.com/files/58818e56-9ec9-4908-898e-45785e0a1fc4/gmat_official_guide_13th_edition.pdf
    • https://uploads.strikinglycdn.com/files/a7bac90c-db27-4289-a047-53e71945922a/70883680362.pdf
    • https://uploads.strikinglycdn.com/files/b5ceced9-3b51-4111-b5f3-2005826db7a9/46232735063.pdf
    • https://uploads.strikinglycdn.com/files/ff9dd55b-9a17-4f58-a17d-4599d1ca2f8c/exercice_droite_demi_droite_segment_6eme.pdf
    • https://uploads.strikinglycdn.com/files/29c7df41-8bd1-46c8-b705-b31ce39a5ad2/18736011109.pdf
    • https://uploads.strikinglycdn.com/files/1f0409dc-ce2d-4a62-b8ca-d966f2c0499c/97553032132.pdf
    • https://s3.amazonaws.com/welanisowari/jebesekiwip.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_off0000b998.bin
b5427b9f11651e97df4dc849ab09e083d1e306bc70fb9209bd33d6fe064abff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 5056 bytes
font_01_sfnt_off0000caa7.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 1800 bytes
font_02_sfnt_off0000d335.bin
d2f25cf49961cefb3334f4e81aa3a9fb23e7479d13a0bdaf68d02ed2341fd225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 14020 bytes

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