Malicious PDF — malware analysis report

Static analysis result for SHA-256 731a10660c437b26…

MALICIOUS

PDF

108.6 KB Created: 2021-02-22 09:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 38116157c61f22ec52b7b5dbc7d1aaa6 SHA-1: e8921e4a4771a7eb366f95d5cb21cda4381b8e2f SHA-256: 731a10660c437b2627a5c15d07c1a869e068471379fd7790db457cc01b11ebd4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to external malicious 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://baarspo.ru/strik?utm_term=administracion+de+medicamentos+via+topica+indicaciones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5ffb39f9dcf20.pdfIn PDF document text
    • http://brumbum6.xyz/katafe5lju5.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/bolominizereg.pdfIn PDF document text
    • http://card2card.live/dual_enrollment_georgia_deadline3d0x4.pdfIn PDF document text
    • http://medefoduma.iblogger.org/en_nombre_de_la_rosa_pelicula_completa_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/WR5ihjj/papabubidikamufaxel.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/vigsiay/77789595913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5ff619e94c882.pdfIn PDF document text
    • http://wuwubaga.22web.org/kovisaluziwer.pdfIn PDF document text
    • https://mulaxenowaw.weebly.com/uploads/1/3/4/8/134862071/4363790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_600716961629f.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/heroes_of_71_retaliation_gameplaygpnsx.pdfIn PDF document text
    • http://mirror-x.org/best_wheat_yield_per_acrexoi97.pdfIn PDF document text
    • http://pexiwaz.iblogger.org/startup_business_plan_presentation_template.pdfIn PDF document text
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/a00d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60176a72cacfc.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixevafuzija.epizy.com/26242549538.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/freemarker_email_template_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F43 2112 bytes
SHA-256: 35a30379f3afa37b361ed9e67606f814b381684efe99a47271b922ae3d4f0f81
font_01_sfnt_off000168e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E9 5236 bytes
SHA-256: 90935f4e1241a31b7a98a27698932ee1545a9a42712c4107d9c97ed9f233f14c
font_02_sfnt_off00017aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA8 12508 bytes
SHA-256: f44432a7d1842f76f3cd99ef36136af1816925a857dda5ab46a753ec58e01bc4

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