Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b67e6dfa5060b66…

MALICIOUS

PDF

75.2 KB Created: 2020-11-17 14:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c061e81304801aee74b5ba15c2a45be6 SHA-1: 1357edcda42e8ee1ebcd22ddebdb49f638d0c3f2 SHA-256: 9b67e6dfa5060b66d6b0dcbbcd6c50016ae81f496dd5fcd4e4d9f293414b2de1
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to academic activities. The primary malicious URL identified is traffset.ru, likely serving as a landing page for phishing or malware distribution.

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://traffset.ru/123?utm_term=capstone+student+activities+unit+2+lesson+7+answers
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f9458e599708.pdf
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5fa8cba239214.pdf
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/sejini-dozakomi.pdf
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/3369843.pdf
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f9703552e190.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/37715750-50f8-487c-9d7a-a6be6a9bece7/purple_door_christian_childcare.pdf
    • https://uploads.strikinglycdn.com/files/26b8b1f6-418e-4c7a-842e-af6fed065d1d/42510818650.pdf
    • https://s3.amazonaws.com/gogoxowiniza/49828271523.pdf
    • https://uploads.strikinglycdn.com/files/8ffba2c9-99b9-406b-abbb-0d34a3a7ab62/mirakalotovibezapog.pdf
    • https://uploads.strikinglycdn.com/files/42f75c92-a823-4a35-8529-5927cea7e8cc/rules_of_thumb_for_chemical_engineers_branan.pdf
    • https://s3.amazonaws.com/dekogamik/75681909967.pdf
    • https://uploads.strikinglycdn.com/files/5634a806-e207-48ff-9f28-b77181f72587/lexmark_5600_to_6600_driver_download_windows_10.pdf
    • https://s3.amazonaws.com/felasorarabipis/lixusewuvagagamasev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e980.bin
ac2e2844b5c84391db0bd6cbf17947a537b5780a87a014d07bca89b22f794fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 5336 bytes
font_01_sfnt_off0000fbd0.bin
e6e7e75f30bb6c531995a364d26f8dffa0b82e7b5471e3c853747b87855d164c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10616 bytes