Malicious PDF — malware analysis report

Static analysis result for SHA-256 b755fbbefba18372…

MALICIOUS

PDF

83.9 KB Created: 2021-02-24 21:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0afb606926cb1955e7f7176b3255f09 SHA-1: bb4216ed05f12fbd18ebe7bfc40f23b3d46be2a3 SHA-256: b755fbbefba183725933fdd0d6d6a2f376a2b0e6d3ac2f76d1843ab3e8fbd341
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF's purpose is to redirect users to potentially harmful external 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://druttle.ru/123?utm_term=death+note+movie+2006+cast PDF link annotation
    • http://dosijefa.mypressonline.com/bopubemigalozepubub.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/why_is_it_important_to_have_clear_goals.pdfIn PDF document text
    • http://remontlegko.info/90526263184hb8dn.pdfIn PDF document text
    • http://50offstore.info/38851414194r4kif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_600e86f22ee78.pdfIn PDF document text
    • http://bloomwithdeanna.com/monkey_types_for_petscyn0s.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_long_does_fossil_gen_4_battery_last.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • http://health2health.online/temigobijb.pdfIn PDF document text
    • http://abanca-electronica.com/sofudepoduwakowgv4u.pdfIn PDF document text
    • http://chaptejvxz.fun/pumijewsmo10.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/xegibuwalek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapoguxesak.myartsonline.com/baserimizulapaxituga.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/65795335611.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_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 5396 bytes
SHA-256: 12ffba9bcbb6ff90f68940bdf4a7b76a7dafba38fda10cc41dbf9d9847e9b68a
font_01_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 10896 bytes
SHA-256: e58ec411b27729a955bdb3a125438a4b95636b576fae547f7ebb4038400908a6

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