Malicious PDF — malware analysis report

Static analysis result for SHA-256 43280d0738bdecf3…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 02:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: acafba86dec2432f1c16c63133c0edbf SHA-1: 35ce47f2f8df9e5fdda7545232599ca99479c93d SHA-256: 43280d0738bdecf3f3f9c56c89bc4b8ab92d67dcf0f9802f65528fbf14b0d623
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=sacred+pathways+book+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fef37ff196cd.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/fOhgRhj/76427538728.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/da43ca8f83a7.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cHwVbrj/how_to_find_top_hashtags_on_linkedin.pdfIn PDF document text
    • http://pimuxiv.22web.org/95522680773.pdfIn PDF document text
    • http://zexinebizo.22web.org/fasadakopufazukap.pdfIn PDF document text
    • https://cdn.sqhk.co/walekikem/ibihicg/75874122409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc5a4ccd8fe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fcd6c27b7a4c.pdfIn PDF document text
    • http://kexazejarufag.iblogger.org/76335608824.pdfIn PDF document text
    • http://kikovetademu.22web.org/xekokaxuzowaloxunum.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/mizeteb/barcelona_pavilion_floor_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/all_albums_apple_music.pdfIn PDF document text
    • http://tuzivapevof.epizy.com/6834974266.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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5784 bytes
SHA-256: 477fcca68e65d029bc84d621510529d09937f7465230170ddbdf7ded53c7d89a
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 11348 bytes
SHA-256: 3a45bcd359fb36669ac4b6bb1fb1b907987cc0342953d16d7304629eef15ffba

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