Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ccb536a83dd5f…

MALICIOUS

PDF

79.7 KB Created: 2021-02-28 15:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 37f5ba1036992090051993bed0acc97c SHA-1: c10fd20166bc996b2de5c45b03c51ff2b9ec411f SHA-256: ad3ccb536a83dd5f6fa856f9aee689bf0eb7c2c44437ce5a1a964e99781ff6c5
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly indicate malicious intent.

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://golowaki.ru/123?utm_term=most+heroic+man+in+history PDF link annotation
    • http://penageli.getenjoyment.net/can_you_use_a_universal_remote_on_a_hisense_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/sudofeno/hejbrgh/ninja_stick_weapon_name.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/gdB5gdl/lolexomijitij.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/how_to_calibrate_bosch_glm_20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463262/normal_5fe19856e5795.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/how_much_do_content_managers_make.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6011e26d311b7.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/aOV8Ahh/gijipalowaxijiwemewetapev.pdfIn PDF document text
    • http://lareluso.iblogger.org/soccer_drills_for_4_year_olds_free.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/66924318804.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/25032840404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fdc6ef9702be.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/apc_back_ups_pro_550_review.pdfIn PDF document text
    • http://dajexori.mypressonline.com/beginner_python_courses_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/97746454452.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/98989331647.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 5112 bytes
SHA-256: 85aaf20cffd033c0abe594525f4358524c1e88e4817793cbc9b19197b56d3b7c
font_01_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 11600 bytes
SHA-256: b21000301d19e7a55783ebcc0baad48cbfca9fa45b39efcf1070e1ab09cfb372

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