Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fdc981dba43975…

MALICIOUS

PDF

74.6 KB Created: 2021-03-02 23:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 764005cb4a7dfab9034b225a314ac841 SHA-1: b18b7eba5f4c3c0ba3fd0212179a901715cff731 SHA-256: 91fdc981dba4397549076fb56bc9a4512dd6133434d26b577374dbb7d57dff3c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru' and including a 'utm_term' parameter suggesting a tracking or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt to redirect users to potentially 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://leonvi.ru/strik?utm_term=how+much+is+the+s9+plus+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382958/normal_6009d78eed8e5.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/husqvarna_440_factory_carb_settings.pdfIn PDF document text
    • https://nobujudiwid.weebly.com/uploads/1/3/1/4/131452838/5412289.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/mopozepomosej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_5fc7c6e046bcc.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/65a8cae.pdfIn PDF document text
    • http://alkim.xyz/xutotatu3pm7j.pdfIn PDF document text
    • http://alluniversity.fun/bigfm_radio_frequenz_stuttgart7i2rg.pdfIn PDF document text
    • http://ipatovaalena.ru/ffv_advance_gameshark_codesau3t7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_603de363b9db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5ffe8ed85c3a5.pdfIn PDF document text
    • http://onsideball.info/168307152541d64f.pdfIn PDF document text
    • http://frut-tree.site/illinois_reg_1_formvy93n.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/4212496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/67953287358.pdfIn PDF document text
    • http://litorow.myartsonline.com/mtv_the_challenge_inferno_2_episode_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/futupakej.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/tafak.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/51739028047.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5172 bytes
SHA-256: fd041c9b3c65779919ed66e518575a0b6be2ce23418208d9bbb1cee367fbee96
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10952 bytes
SHA-256: bd57d25df867b1de3fa829035e778da1fc40147e868bfdffa4ce867105e499c4

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