Malicious PDF — malware analysis report

Static analysis result for SHA-256 4241a24b8c490124…

MALICIOUS

PDF

63.8 KB Created: 2021-03-21 23:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e888925c65ebbca38276add475349a9c SHA-1: 1d8800cc0e63105febfa837b3d5bdc9a46f03dbe SHA-256: 4241a24b8c4901240d623cb16a697b23fecf19b0de9f6c97ce88236fe940c0ed
212 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=namakam+chamakam+pdf+sanskrit
    • https://cdn.sqhk.co/lakekomum/gcidhfQ/amazon_music_spotify_oder_apple_music.pdf
    • https://cdn.sqhk.co/nivopekodi/EzjG7ja/mobile_tracker_pro_phone_locator_by_number_apk.pdf
    • https://cdn.sqhk.co/medefitama/hgDRgeC/zepipemozojatunirimom.pdf
    • https://cdn.sqhk.co/kosifodalab/Mi1Kgio/vazipo.pdf
    • https://cdn.sqhk.co/wugeguxu/ifOjegD/bodufudetuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_577e718c8c5443deb7e90962c0ffe189.pdf?index=true
    • http://buvodadixasiz.epizy.com/texupurudonifixigirukareg.pdf
    • http://jimibidubarabus.epizy.com/mossberg_500_serial_number_location.pdf
    • https://s3.amazonaws.com/ninasivol/baltimore_classification_of_virus.pdf
    • https://uploads.strikinglycdn.com/files/2c4fad43-0fcb-45e5-a034-87c0a93b2531/77478312929.pdf
    • http://digopepu.epizy.com/pajirafudolaxovi.pdf
    • https://s3.amazonaws.com/paxunu/topology_optimization_bendsoe.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_c6962b179bc04956b536cbdd7977f4fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f76057bc-7041-4a53-a899-5b24fa3274d7/dujuripijalatarazaxopa.pdf
    • https://s3.amazonaws.com/dowavelaxam/document._createelement_link_stylesheet.pdf
    • https://s3.amazonaws.com/zuxime/formidable_stromae_traduo.pdf
    • https://uploads.strikinglycdn.com/files/a74627ff-a482-443a-bab9-01c8264481bd/exam_questions_and_answers_for_business_ethics.pdf
    • http://regenazuwirege.epizy.com/ibps_clerk_preparation_books.pdf
    • https://uploads.strikinglycdn.com/files/14c25e3b-0373-45af-ad99-9794ec21e165/what_is_sociology_and_anthropology.pdf
    • http://fozovevozasox.epizy.com/lonamurolatavupowavu.pdf
    • https://s3.amazonaws.com/vedexajawo/tozepovukegaxebu.pdf
    • https://s3.amazonaws.com/tuxenipup/isobutyl_formate_structure.pdf
    • https://s3.amazonaws.com/fefurorobumi/xewejosavalixotu.pdf
    • https://s3.amazonaws.com/jazofi/6430214514.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb27.bin
7d0256d5adf6e6f8bbb535c08ef6a044a42090792678ab0ebd3840d1b1a07326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5396 bytes

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