Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e9a6316a205bcf…

MALICIOUS

PDF

75.8 KB Created: 2021-01-28 20:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 220dad22439172d5b95a71bf67fba03e SHA-1: 6ce4585a88af3b78e1015adbb63b0401531cc1f4 SHA-256: 84e9a6316a205bcfdbd80b4d637c9d514e2738911e09f72f3a77b9b002355ee8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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://jacksth.ru/123?utm_term=queen+black+dragon+guide+melee PDF link annotation
    • https://cdn.sqhk.co/sasibasodiwu/hKlm3lz/12610103303.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/8M5hcOs/rocket_man_song_used_in_movies.pdfIn PDF document text
    • http://modernstyle.pro/25566928589ie4hs.pdfIn PDF document text
    • http://characduwe.space/266207825931npj0.pdfIn PDF document text
    • http://haifaiv.ru/european_sports_car_racing_series24uuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/iPNvChh/autotrader_usa_vans.pdfIn PDF document text
    • http://esportzmlevent.com/mexamubisilogiwijr2aa0.pdfIn PDF document text
    • http://vas-rem.ru/scentsy_buddy_packsfka4z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fd2f823dc79f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fccc33656d7b.pdfIn PDF document text
    • http://se-mrush.com/home_arcade_system_v3._2p5085.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/bigsxjT/yahoo_weather_app_symbol_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hPie72z/47291909788.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/YjekdAA/varoju.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/tzZginl/dobawasizuzuwafagebometug.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/qjdii8R/leatherman_skeletool_kbx.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/EghnNib/54066481598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rosukijabadizi.epizy.com/26012778059.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 5148 bytes
SHA-256: 27db725d199dfc3748703a5325a856958a1b6ac62369eee5c972b2b5accb0102
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 10428 bytes
SHA-256: 08de50d9d5495bd57ec061a09b218bfa7fe8d3e7e53d7ed5ab375399c67af1c3
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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