Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca0ac1a65490d76…

MALICIOUS

PDF

74.1 KB Created: 2020-12-30 03:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b41dcf40637e98b59f756695160f0bc SHA-1: f7e764050759a19aad036a0cb880c6770f2292be SHA-256: 2ca0ac1a65490d763708375ceb192a13afd90449cb0d4ce31486ff5fd91804d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" containing mass external links. One of these links, 'https://trafffe.ru/123?utm_term=tour+guide+script+sample', is directly associated with the file's apparent lure of a 'tour guide script sample'. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

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://trafffe.ru/123?utm_term=tour+guide+script+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f87fedfa757f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fc8886637483.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/UoZSicD/ates_ve_su_11111.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/ghgSibN/monkey_racing_mod_download.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/sorovog-jomagofog.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/wefadep/pujurem.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/59817693722.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/68044045161.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/38574625280.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/catholic_baptism_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/gidoxisivigulasovedeti.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/famous_spanish_book_writers.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/curso_de_violo_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/destroyer_movie_2018_parents_guide.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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 5340 bytes
SHA-256: 779a5bdc11d8f53c7e35ae0d72271185888f06ac7dd05bde359db267849d24fe
font_01_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 2032 bytes
SHA-256: 59fbbb53b0c219108c5d952f9f15e120f4c7998529b70d622cfe4a9d27dfd089
font_02_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 10728 bytes
SHA-256: 4db5f10bee5ba54df4ac057cc1f826448f3f390dd453f78e236260fb562e471e

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