Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f4b885e81d1d9b…

MALICIOUS

PDF

67.4 KB Created: 2020-11-24 06:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 73e1d2b749f21693f047fed7a0efd5b1 SHA-1: e003ad0c20e21142a6a26e56c7e202477fdcd264 SHA-256: 98f4b885e81d1d9b3cff7955b641ba8f6bd7ae1e5c1b97b9d2908a1dbb3d7913
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 external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://traffine.ru/aws?utm_term=fidessa+sentinel+user+guide', suggests a pretext of providing a user guide to entice clicks. The ClamAV detection and ML classifier strongly 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://traffine.ru/aws?utm_term=fidessa+sentinel+user+guide PDF link annotation
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/6d23bce78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fad67fd521db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8a5f4177dbe.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/jesidofefe/how_to_get_slime_in_minecraft_1.16.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gadesap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d475564a-62ad-4e6c-8781-8d3d09a3c646/bopegenoju.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/kinematic_equations_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e8c748-3ff9-4e7b-90c7-97d3228fabb1/25328951544.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/star_wars_kotor_2_influence_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/96359716862.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/myopathy_in_feet_and_legs.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/beads_in_hair_trend_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/gobujidiboguguvab.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/82333473197.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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 4948 bytes
SHA-256: 940691eae5d05099e5dc8f8d15cf41c85c57e92dbff6f32d015de62421b20c4a
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10824 bytes
SHA-256: 5eaaa7b34672d94ffafda844097f684abf872a798a0a209d19df92436dd8bd56

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