Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbea4242e5192e21…

MALICIOUS

PDF

69.3 KB Created: 2021-03-21 06:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0bf0df3c8c5fdcc7b8d7f03ffed07c2 SHA-1: 9f674f90d59860008687af21e0e9c9acd6d296f9 SHA-256: fbea4242e5192e21c3ecf739a43491ffc6bd0dc3f0d27a13924be760a3b0a80b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/award?keyword=cambridge+primary+mathematics+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455180/normal_601d51342d1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_600bf26044053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fdd370a780ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5feb8c261ec5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8b7eb6e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_6040ff327bee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_603cfd1c7c7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_603c4db2d39db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_cd319bca46ec4f579155c0b1625473f2.pdf?index=trueIn PDF document text
    • http://lojizigakuxit.epizy.com/age_of_empires_2_google_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/nupobakulasefufekarewo.pdfIn PDF document text
    • http://pirapisanuton.epizy.com/dewibo.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/gigagolu.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/small_powerpoint_to_word.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/927759211.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_f27b5b42a89641abb1610d654f38fa18.pdf?index=trueIn PDF document text
    • http://jisevara.rf.gd/bronchial_asthma_review_article.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/vazefikukenoj.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/mikuledasudobagit.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_71dac7404dd54c4c8062b53eb161b1aa.pdf?index=trueIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_8515753835fa4eff89c554ed6945a958.pdf?index=trueIn PDF document text
    • http://pedirutufojo.rf.gd/buluzikogemone.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/88750620227.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/xebajub.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_74e1c7702d454414ab73dd9d0b4a3a61.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_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 5736 bytes
SHA-256: 61f5161c5278b6a2165774ec85380818d7b87be2f1fdc80f8f683d485f4b0272
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10744 bytes
SHA-256: a4982a5e3c152c2814cd0c95e27b1b44a95eae4078c282693d83f9ab13fa3837

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