Malicious PDF — malware analysis report

Static analysis result for SHA-256 21736cec0486a5a7…

MALICIOUS

PDF

82.2 KB Created: 2021-03-05 03:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ba8666ed03f8e054a4e4d037ef34f9e SHA-1: cd025b016785346a5b6dd645e090b8cbe2bf2693 SHA-256: 21736cec0486a5a73791ff159f5569ec2b481a0249dede2f24c94836d08d581c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=how+do+you+label+area+of+a+circle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5ff05e5737849.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/sole_e95s_vs_e98.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/46628441068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ffb842e0073f.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/8773056317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd5f2e09390f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_60260c85b0800.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/sat_grammar_practice_test_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fde24595de12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451950/normal_5feebd1f6b82d.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/93149483629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/the_end_of_the_f_world_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/35324757685.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_75963ba787164f06a8468e154bb81d2e.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/what_geographical_features_led_the_ancient_greece_to_create_city_states.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/jinefi.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/how_to_draw_cool_3d_things_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/tufogimanojawopolif.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/rivaxowivuxovik.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/80330077149.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_439f6c5e9b764046b92ddb67a83f25df.pdf?index=trueIn 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_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5132 bytes
SHA-256: 0ce18d9c7af79ec25994a877190c5053b33c4f9422fb5a5109c831af4416a2d0
font_01_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 11392 bytes
SHA-256: fe807b82118a21112751c375fa969c76c54fed8abd9ebfd9ffd5a62f50045a42

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