Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb52d5a4576f9e1…

MALICIOUS

PDF

76.1 KB Created: 2020-11-19 12:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 883cd33735ece8d86b793674770a941b SHA-1: 50b60a3762da30b361c8cca9f6108a3043c73922 SHA-256: 7bb52d5a4576f9e18a4483922cd9be3bc048b03971e4c750489db98e52729793
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, with one pointing to 'traffset.ru', suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains text related to 'Coachmen rv parts manual', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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://traffset.ru/123?utm_term=coachmen+rv+parts+manual
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/04240046458d.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8e4789ee051.pdf
    • https://cdn-cms.f-static.net/uploads/4467030/normal_5fa33ae22752f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kewakuko/rineferijokibanet.pdf
    • https://s3.amazonaws.com/wofaxil/59006301501.pdf
    • https://s3.amazonaws.com/xanebavifamopez/plus_two_ncert_biology_textbook_download.pdf
    • https://s3.amazonaws.com/pezofut/dogizadavokugogugifal.pdf
    • https://uploads.strikinglycdn.com/files/d6479991-af56-420b-a6fd-2602e69d5e0d/riwesigisivepalegid.pdf
    • https://uploads.strikinglycdn.com/files/9b5369e9-6b8f-4b1d-8441-0fa6331a6be3/7931910682.pdf
    • https://uploads.strikinglycdn.com/files/daa81bc9-95e7-41da-ad34-848a12f26bde/electronic_repairing.pdf
    • https://s3.amazonaws.com/tifuwuw/4584871098.pdf
    • https://uploads.strikinglycdn.com/files/1949826a-7c5d-41fa-b9fb-91d84a50447c/72665857208.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb96.bin
d3661cf8e8cb5d29b9aedad8a04a026032f9701bc139d7f5c8047d37c9df58d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 5088 bytes
font_01_sfnt_off0000dcb3.bin
2b8e8b6af346a5d54324e9f05f2e051f88ef7bd683b67c5c1a36d70958633636
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 8800 bytes
font_02_sfnt_off0000ef78.bin
8919a2e9f62a1ff6aad503f1838f19e79442820c2b1bfb1b5aff88d94ade655e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 11184 bytes
font_03_sfnt_off000114c6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 4324 bytes