Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31d6a19cf45a280…

MALICIOUS

PDF

85.2 KB Created: 2021-02-23 03:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3b62cfae2d01a220bbc077e759fdc630 SHA-1: bafc4dd0acd03d55c5e935ade927dcab94338688 SHA-256: e31d6a19cf45a280190b3870fdc05018c0b198aab2325c0a832cdd0213afa01e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links suggests a link farm used to obscure the final malicious destination.

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/wix?keyword=falk+firebeard+and+bryling PDF link annotation
    • https://cdn.sqhk.co/kinemefuwa/QLFoicB/86296347302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_6025aba937888.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/Zhbgfib/bubisidop.pdfIn PDF document text
    • http://tebaxal.22web.org/birds_of_tokyo_lanterns_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/y0zWzig/kijoginujek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381547/normal_5fc7bff74e963.pdfIn PDF document text
    • http://xurivikarode.iblogger.org/energizer_nimh_battery_charger_chvcm4_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/cLhdWMH/minecraft_horror_maps_for_2_players_pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fd7903f5efaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibirat.rf.gd/55480339846.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/58554478607.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/sesemukijefajunepesefu.pdfIn PDF document text
    • http://sefamuw.rf.gd/bsc_degree_certificate_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/madinatenus.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/xikireduveweliwananoket.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/india_visa_application_form_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 5156 bytes
SHA-256: 824ef8892c0c71370695e02df9435c65069d3bdedb92b2de967dc059b9ba72b8
font_01_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 10316 bytes
SHA-256: 10311c7c7e27c852ef2a18ac0259e2b88b35a3ded2d620832c2ba4ffb46a9ebe
font_02_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 17300 bytes
SHA-256: 52015744bb050ef4194ab6bf023eb99b4b23ce3a800c5858915777899d822637

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