Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8efd8e63b6a601f…

MALICIOUS

PDF

66.0 KB Created: 2020-12-22 02:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b0dec950d10edae6ff4a4357a066336 SHA-1: 9871af410d70675d98bea40815289f513bedb13a SHA-256: d8efd8e63b6a601fd1f861c50ed1beeb0b70ebb086608997523339bfb62225b8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'traffine.ru', which is likely part of a phishing or malicious content distribution scheme. The ClamAV detection and ML classifier also indicate malicious intent, classifying it as a phishing trojan.

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-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://traffine.ru/123?utm_term=nicktoons+attack+of+the+toybots+ds
    • https://gugajonegil.weebly.com/uploads/1/3/0/8/130813642/4181a2c9225.pdf
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/13fce.pdf
    • https://cdn-cms.f-static.net/uploads/4390381/normal_5fad845dacbdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinadi/dabawofelixabug.pdf
    • https://uploads.strikinglycdn.com/files/529e682d-71df-4f85-bfe9-91ea41f0e85a/audio_technica_pro_88w_r_manual.pdf
    • https://uploads.strikinglycdn.com/files/c366e6e0-a910-4b42-82b4-ad2225b7d46b/72132629887.pdf
    • https://s3.amazonaws.com/zirojopemup/bending_stress_example.pdf
    • https://uploads.strikinglycdn.com/files/0bf897c6-0e2d-443b-8b4e-0284fde55e9f/baby_girl_names_that_start_with_the_letter_b.pdf
    • https://uploads.strikinglycdn.com/files/b7b4a563-4ded-4e18-af13-6473f6eb180d/radiohead_the_bends_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/3229e343-b260-4e52-95c2-183654651e93/fasudovoviridizebeso.pdf
    • https://uploads.strikinglycdn.com/files/b4652209-7e7a-4ebf-b1ec-4071d7d25581/georgia_milestones_coordinate_algebra_study_guide.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_off0000c50d.bin
46231547ae67027a65dd89d9779bcf91624d25a278b3611a474425ed02998d19
pdf-font-stream PDF embedded font (sfnt) at offset 0xC50D 5256 bytes
font_01_sfnt_off0000d707.bin
4f69978a4343f417acc5faef06464267131e53d764e01ef24e4288f23a5d4fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 10724 bytes