Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d25df9bffb3a23…

MALICIOUS

PDF

76.9 KB Created: 2021-04-12 19:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8daac1ab8e460f1a458e2de7e9b83cf4 SHA-1: 81a4e5b797848e43bad4d299afcce98e49f85e58 SHA-256: 50d25df9bffb3a2394d10e05faa5aa5da6ac58194fc8473fcd9fd4dd39ebbd6c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, 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 links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=how+to+arrange+descending+order+in+word PDF link annotation
    • https://cdn.sqhk.co/zesojesiwi/gckghOj/when_fall_break_starts_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fd7d28773903.pdfIn PDF document text
    • http://copyright-infringement.business/kazadokim1xqz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_601113317950d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369655/normal_5ffa9601255a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_60615e202cff1.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/ijiHxoU/qte_kung_fu_masters.pdfIn PDF document text
    • http://rewutudot.iblogger.org/66240313636.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/iugG1hc/cell_lab_evolution_sandbox_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/t0NhhaR/telegram_x_desktop_mac.pdfIn PDF document text
    • http://marketes.pro/87796818712uq1ei.pdfIn PDF document text
    • http://about-igsupport.com/how_many_calories_in_a_medium_frozen_coffee_from_dunkin7t5ci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_604acc2d96b2f.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fe0ff7b727bc.pdfIn PDF document text
    • https://cdn.sqhk.co/genazeres/hheKSpA/35276423663.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/ikea_australia_catalogue.pdfIn PDF document text
    • http://tijidewun.iblogger.org/rotuvujivogovabiputofano.pdfIn PDF document text
    • http://insurancecarusa.com/autozone_employee_handbook8mz4h.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/zivoxetugimosemesena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lurorozowuwa.rf.gd/31068836986.pdfIn PDF document text
    • http://noxikemudenuma.epizy.com/47330190875.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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5128 bytes
SHA-256: 0d371b07c7efba987194b60d774ee8112c7723ca01921367c3e33c404b4add5c
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 10544 bytes
SHA-256: 6cae91bc8721ef89512c55c102c8f756289197e2c4c8404ca5963ca063f50fc1

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