Malicious PDF — malware analysis report

Static analysis result for SHA-256 d946218bd2f90a5b…

MALICIOUS

PDF

70.9 KB Created: 2021-04-16 00:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 69797237bcf9da711f154c995291635e SHA-1: eb6953076a2321f2f09f89f9a90d6cce691df1bb SHA-256: d946218bd2f90a5bd23c69530a3518e6462afd3583a49ae864941903de1abcbf
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to 'botokaw.ru' and a query parameter suggesting a lure related to firearm magazines. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=bersa+thunder+380+acp+drum+magazine PDF link annotation
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/fevarijafajiv-tewekarawimati-supedigex.pdfIn PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/wazeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff637a8d0f45.pdfIn PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/393a8a5f3e.pdfIn PDF document text
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/45efb3c2fd54cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6056dd867bf8e.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/fanaboxutizibinuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5fdd21906e2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_602de165a3bfa.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/f183e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_60160d9b4b3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_6063db7f695b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff8271fd6b2f.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/dorulusof/11090825029.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/can_i_pass_ccna_with_self_study.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/mobogenie_apk_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/tesla_model_3_price_in_ukraine.pdfIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_404758c8961a49bf878391a7567e95c2.pdf?index=trueIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_62c016c353324ef99fc3c64f31f6637b.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_7982604cd05f4ff1981c0532416e833d.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 6052 bytes
SHA-256: f89d676b5e1d4fd4840acea28c9e82a2adca9a0e293a31382da617bf80fb98de
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 10808 bytes
SHA-256: c44cc71bba96b012fc66f51ae22835706673ce278999820d3bcea17dc1fc3891

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