Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e593cd0565a793…

MALICIOUS

PDF

80.7 KB Created: 2021-04-06 14:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aa97716e7125ea5938bf0422eb1ffc33 SHA-1: 8e03b0438d96e9579bb83a15c52bbfa83a52060c SHA-256: a8e593cd0565a7932fa71f2aee19bd3b5d309560b32cb17bfb1bc54a86c96912
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://vilenefex.ru/strik?utm_term=how+to+reset+insignia+bluetooth+speaker', is presented in a way that mimics a search result, likely to trick users into visiting potentially malicious or scam-related content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+reset+insignia+bluetooth+speaker PDF link annotation
    • http://menazubuta.iblogger.org/angelus_prayer_latin.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/f114f54eb3d6.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/8918576.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/88242316962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_6025589a6bba3.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/converter_em_autocad_online.pdfIn PDF document text
    • http://berkeciftci.net/accu_chek_guide_lancets_walmart4sdld.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/b2206f689b4.pdfIn PDF document text
    • http://lakcherie.ru/vadimevupogegovonopuk29iq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fce5f52d37f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_602d0169a46e2.pdfIn PDF document text
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/ce1c877131.pdfIn PDF document text
    • http://bokexetukesu.iblogger.org/management_of_enteric_fever.pdfIn PDF document text
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/terajaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_60358a249e2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fe868f349597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenomubuwisi.epizy.com/47774886636.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_750b5b0770f34edc95ccc0c6ea15fa32.pdf?index=trueIn PDF document text
    • http://rivenoke.onlinewebshop.net/blended_learning_cookbook.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/10050782177.pdfIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_1e0070035fd945ef891273c5e4ce2863.pdf?index=trueIn 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_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 5340 bytes
SHA-256: 3012049e63503e6832e7c4ccbf98da4f7c16d4d9b855d813258d1f8aed960dcb
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 12320 bytes
SHA-256: 4bd6bdc14370464d0bb87c65c3750c301e820af87f81e2a4f727f0fab2f947f2

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