Malicious PDF — malware analysis report

Static analysis result for SHA-256 681ce5014a137b1c…

MALICIOUS

PDF

50.6 KB Created: 2021-02-27 22:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0f79d704f0e68cc1404041b979004895 SHA-1: 77d04ac1630ee757739e376d40508d17a688f042 SHA-256: 681ce5014a137b1ceb44a1acb654745a03cbbd4dff7c12b4e9a5695f7e859279
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or distribute traffic across multiple sites. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6878

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://druttle.ru/aws?utm_term=1999+yamaha+kodiak+400+oil+change PDF link annotation
    • http://manovina.mypressonline.com/lorewevaluxo.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jbbhbjf/alien_shooter_2d_apk.pdfIn PDF document text
    • http://nafugelinev.iblogger.org/proofs_involving_congruent_triangles_answer_sheet.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/xodopigivipobirifa.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/GNjejc7/noperiwazapujal.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/sNfjcji/kukusidarewat.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/OgdDghn/games_like_run_an_empire.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/best_free_android_tv_remote_control_app.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/thyroid_management_guidelines.pdfIn PDF document text
    • http://vonanovab.epizy.com/what_is_aggression_a_sign_of.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/40265537663.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/guided_practice_worksheet_graphing_linear_inequalities.pdfIn PDF document text
    • http://titasigor.epizy.com/34059625658.pdfIn PDF document text

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