Malicious PDF — malware analysis report

Static analysis result for SHA-256 57def62961b8227f…

MALICIOUS

PDF

73.0 KB Created: 2021-01-06 03:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb783de6e01aa0f0353535b1e825cf5a SHA-1: b7e94dd9fad7d4d725319dbcff8dbae4d2500e31 SHA-256: 57def62961b8227f8e627ce6f21c81c85d2d2bf304b793f7caf7a383ef43f2c8
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 link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=north+america+physical+map+outline+printable', suggest a lure to a malicious website. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a network of linked pages, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=north+america+physical+map+outline+printable
    • https://cdn.sqhk.co/wezokobuli/jeggVjf/bixogunurex.pdf
    • https://cdn.sqhk.co/jajotulix/idjeUji/18163522805.pdf
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/6665408.pdf
    • https://cdn.sqhk.co/vateviti/tjigjgf/amazon_music_app_not_working_on_windows_10.pdf
    • https://cdn.sqhk.co/sopiloroda/ibiaYnk/wifibutulokezumigalatuv.pdf
    • https://cdn.sqhk.co/zipirevofu/gclgija/13917667188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jebokizez/zinivo.pdf
    • https://s3.amazonaws.com/rutufokedizon/10426290870.pdf
    • https://s3.amazonaws.com/wisatutadi/lesson_10.1_skills_practice_answers.pdf
    • https://s3.amazonaws.com/piwanisaj/74251711967.pdf
    • https://s3.amazonaws.com/levovod/7493782089.pdf
    • https://s3.amazonaws.com/mejigavukolu/togame.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_off0000e26d.bin
e9e6000c8a8268ca9fffcb64a1f7b32926499331f12d8f98b3bee411d250d8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5384 bytes
font_01_sfnt_off0000f49a.bin
b75051f75925d380404cade9e353b021c8cd70748fb956d7fb44ed96d58503c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 10076 bytes

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