Malicious PDF — malware analysis report

Static analysis result for SHA-256 497d71f80480e64c…

MALICIOUS

PDF

81.0 KB Created: 2021-04-22 20:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff795d7c2f248ed210de76d9c25376e8 SHA-1: dea684f6d72b2e5064c21d73948d3db079f35f61 SHA-256: 497d71f80480e64c0284aefb6fe4ac1e159982174a737b99a97340c0255e2291
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=best+software+architecture+diagram+tools PDF link annotation
    • http://tizedamini.iblogger.org/xilux.pdfIn PDF document text
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/5211816.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/tiwiwitepajijebusivu.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/h6qcheR/fepudujobovamer.pdfIn PDF document text
    • https://fudaxanoduvilu.weebly.com/uploads/1/3/4/6/134626593/9691567.pdfIn PDF document text
    • http://nusukopov.22web.org/split_air_conditioner_working_principle.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/hYggvMM/cara_beli_voucher_game_online_via_pulsa_indosat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voturugivorajop.onlinewebshop.net/convert_to_word_document_macbook.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_45fb7ff33b514c6b8c93d24d2ad4b5bc.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_5ab1bd9d3c1d4630ac1d74c2d3ddc16b.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_8fc436789b6241ce8d5158efd98dc1ed.pdf?index=trueIn PDF document text
    • http://vukanaxugosazed.rf.gd/mudepirapapidimizobej.pdfIn PDF document text
    • http://pisibagavorinow.epizy.com/economic_and_social_issues_mcq.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_76da10ed3b1142c78d68cb87b5178f53.pdf?index=trueIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_3c4f312b59bd431188dd6af1370f50f5.pdf?index=trueIn PDF document text
    • http://ruxurosagogaru.epizy.com/archetypal_criticism.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_27e6ad50b1884926ac086bfaa8dc2c03.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 5576 bytes
SHA-256: 4c31bf159dffdc996f7cb0db307b4917279944be9ae58582c09cff79043022fe
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 10712 bytes
SHA-256: 814de3bf040e8ec82ff61c7888f9eecdf5ea7bd5281757fb0247acfd358f1cd7

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