Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca27ea4b9182f73…

MALICIOUS

PDF

117.8 KB Created: 2020-11-29 00:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 445b62b0d9f9e07f9d8bd93aac676a57 SHA-1: 21d2cf77d20e03a0e7d6fd5de1d03f1da62124f6 SHA-256: 0ca27ea4b9182f73b1dbd696587eb51b578013bdd2213e80ce99ced0ffd24188
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/strik?utm_term=ap+stats+2006+free+response+answers PDF link annotation
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/bidajagi.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/rugereneloj-gakufop-besajuzuwip.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/8a4f249643af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f9f142a82e02.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/lerubugefuridobinut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_5fa4381478f45.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/fodepix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92000035-1753-42f0-ac4c-f149e2baa523/ecosystem_worksheet_9th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/stem_club_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/gerlach_report_aras_group.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/roblox_email_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca3bc5c-a0a9-4154-92ed-bfbfc7181462/67417434852.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/watopopedugaxed.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F87 5372 bytes
SHA-256: 9348536c28caca5bfe07d763d2aa3e32acb04b657a92afe0a6914a18e5a18453
font_01_sfnt_off0001a1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F1 11868 bytes
SHA-256: 9e25e65d349c412c4c7d4919a2a98ed03d48226c09cb3e80760a6d0218af9d7e

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