Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e731363baf67116…

MALICIOUS

PDF

67.6 KB Created: 2021-03-28 13:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e44d681d7bff8e0ea7f1c84cde43c792 SHA-1: 4cbe6e5fd4c946e4b87e67fba805b6da8d71398f SHA-256: 6e731363baf671169f778d14a6d4706747a10ec13d5d758311597451a27c61c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, including one pointing to 'xajibur.ru', which is likely part of a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic indicating a link farm suggest 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://xajibur.ru/award?keyword=cantaloupe+island+tabs+pdf PDF link annotation
    • http://anarchymedya.com/evergreen_chords_knuckle_puck0efc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fc848e8429aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_604af32b919a9.pdfIn PDF document text
    • http://vash-fasad.live/classroom_behavior_management_plan_template0oxya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_6053630b17027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fcc0894ee649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_6027da6fbe4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6027059c799cc.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/Yjc9xhb/18497714725.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/igiblIq/12199283710.pdfIn PDF document text
    • http://tlgfree.xyz/711549183975e3n1.pdfIn PDF document text
    • http://hamsterbig.com/how_to_choose_butter_lettuceb0o8b.pdfIn PDF document text
    • http://sell-toclick.online/mebabovofugonoge1090n.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/hfickMY/slide_away_miley_cyrus_lyrics_meaning.pdfIn PDF document text
    • http://loveantravel.xyz/xubinenilukat2fucr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_600600a5349e7.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/l3jejhz/amusement_park_postcards.pdfIn PDF document text
    • http://brumbum3.xyz/how_to_reset_relion_temple_touch_thermometerccehj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 4984 bytes
SHA-256: 77c86d4400b802cef04514dbc0e65522755b292a01140b05c6eec1d6738de3b0
font_01_sfnt_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 9920 bytes
SHA-256: 1fe14903effe2b0aab3232cb664d685c1a2d57449bb7523ecbe0002594d0aa07

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