Malicious PDF — malware analysis report

Static analysis result for SHA-256 366dd91abb511e81…

MALICIOUS

PDF

80.1 KB Created: 2021-02-11 21:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e088fd0d46e7bfcf6b3d2fca8386f49 SHA-1: 8b3fca1b09bfe252611ecb5e133b05f7450ae817 SHA-256: 366dd91abb511e81c9d543c69338a4fb709f1373a4e546b3226f92d351310abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to PDF files hosted on platforms like Weebly and S3, suggesting a link farm or distribution mechanism. While no scripts were directly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to potentially malicious content or exploit vulnerabilities.

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 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://seumenha.ru/123?utm_term=song+of+storms+ocarina+sheet+music+12+hole PDF link annotation
    • https://rivoliga.weebly.com/uploads/1/3/5/3/135311175/d4ae286b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601cccf030dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fd1c55b99a8d.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/ac32cd5b2cb2.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/zajab-mirofavireke.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/kjimjdz/tifawogo.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/iiihdAY/sisajupifagipanaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/jhhTbic/hearts_of_iron_4_dlc_worth_it.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6017c68ea7a3d.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/CheLggj/live_video_of_earth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ff9d91c116ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_601b2838d609d.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
    • https://s3.amazonaws.com/titugome/aromatic_amines.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/charmed_season_3_episode_23.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/signalr_redis_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/tenancy_agreement_template_new_zealand.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/14148558925.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bts_love_yourself_answer_font.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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5464 bytes
SHA-256: 181a3eb59250b524ed49036e6762a960cc5778275f00812cf26111bc5e3f0507
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10444 bytes
SHA-256: f94a9de131370b55fdff811fc1b9a3727d53091524b190aa1cc2102e02016637
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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