Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19e54a128608158…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 13:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cd8872ad7d903dd786ea174ee49092f0 SHA-1: eb87ea7bf43d87b1f678c8a5dde7c92d1a4833b0 SHA-256: f19e54a12860815852c4a7cde3ab2c97009ecd345006b3857d27278455a9edb9
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to trick users into visiting malicious websites.

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://maypoin.ru/strik?utm_term=the+expanse+season+6+air+date PDF link annotation
    • http://strapslap.online/77663203807xv4t9.pdfIn PDF document text
    • http://indir-kazan.com/jafip6zs0f.pdfIn PDF document text
    • http://koolmaxt.online/47171771239q0ywj.pdfIn PDF document text
    • http://sberpodarok2020.online/swinging_stickman_rope_stupendom6u1hs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408718/normal_5ffb418471b83.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/dPhdjhX/pinball_prison_escape_classic_cops_n_robbers_3ds.pdfIn PDF document text
    • http://hamsterbig.com/40862782827p725v.pdfIn PDF document text
    • http://rentline.pro/17784669128yeqy1.pdfIn PDF document text
    • http://biomaniix.website/wutogorijokexizaxedejb8gm.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/cjiaghQ/declaration_dsi_2019_formulaire.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/basezazopilokez5evbq.pdfIn PDF document text
    • http://select-get.top/tetemomelqebmo.pdfIn PDF document text
    • http://thelait.pro/best_lick_in_town_meaningvauoi.pdfIn PDF document text
    • http://afracheat4.xyz/dawuzuwopirj74y4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 5188 bytes
SHA-256: 98ffeff45931e8d8815813d7aa8ba51552fd2b458a538edbf320f1e74c97b826
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10620 bytes
SHA-256: 785a4f936bad5835bc3a92da4f7a0dc055fd840509bcb4fb3098d5cd2c6db8bb

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