Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9dd3b434170a9b…

MALICIOUS

PDF

69.7 KB Created: 2020-11-24 03:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0591857300b5cbd83fa3901a340fe7e3 SHA-1: 25097148b107522e00dadf30ccc1a08f9cb2ed3b SHA-256: 1b9dd3b434170a9bf6e58dca1712977c48c1532ff2da7159c631fd8fbd474945
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a primary link pointing to 'traffset.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM', suggests a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=free+grade+9+reading+comprehension+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fb3e90f46352.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/zetepad.pdfIn PDF document text
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/c4d59e0e8bf26e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fa38044c3ee4.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/mujadawak-muxitafosuxe.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/zerepuzuze/fire_tv_best_apk_apps_3rd_party_source.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/assamese_old_album_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/tudofukirodonab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ec0af8-97f3-4567-b504-83bd649d0b0a/vulofakuvobanuka.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/16104233106.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/reading_plus_answers_level_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9639a7-bb6f-4184-b232-e174492b5dd1/genel_kimya_ders_notlar_petrucci.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/squidward_looking_out_window_meme_template.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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 5724 bytes
SHA-256: 8dce60ca4fd5465b4bd663622ec413875ed4fc794df9eb5cdfba702aac75edf0
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 10364 bytes
SHA-256: dab4c45165b2c8dbc47bddc60127cbbd6720b8e15bdb6cf9bd8692a40870ed2f

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