Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5b7de578d1b406…

MALICIOUS

PDF

69.4 KB Created: 2021-01-04 20:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9877f688b5e1536aa9a7b1cc49f9dee SHA-1: e7fffbeacb4cf70491be78241238e9d6916d0ae3 SHA-256: fc5b7de578d1b40652b42051ebc34bc30deabd3f037c545086ab424e38f02bf1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the final destination, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=free+side+menu+bar+website+templates
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/3d93db38.pdf
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/wedufotitikiposaxe.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/wapon.pdf
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/4462848.pdf
    • https://cdn.sqhk.co/galemojubemo/hji8jjn/90198906770.pdf
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/jewixelijovawaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1be20cfa-d26d-4c97-b2fc-ecbd622009c1/carolina_chaos_aau_basketball.pdf
    • https://s3.amazonaws.com/suzixegazunow/76445783313.pdf
    • https://uploads.strikinglycdn.com/files/a0ad33c0-d4f7-4236-b316-6daa415af686/constructivism_vs_behaviorism_learning_theory.pdf
    • https://s3.amazonaws.com/xebuvuwov/myocc_login_canvas.pdf
    • https://s3.amazonaws.com/davawina/gw2_armorsmith_guide_400_500.pdf
    • https://s3.amazonaws.com/jalasilunaz/gezusim.pdf
    • https://s3.amazonaws.com/nuxepiduded/best_android_simulation_games_of_all_time.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_off0000cfdc.bin
6cc1ef069582d2ed8e8eedb69a8fa6827e9d1ec6c9341967e6220fc416c4148b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 5292 bytes
font_01_sfnt_off0000e1cd.bin
d69dddb9769487306b46b6aec15d1f5a07c36cb45f508341b7f8026c299cee66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 11764 bytes