Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b76771c2c296712…

MALICIOUS

PDF

82.9 KB Created: 2021-03-15 11:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d6affd5369c15e3fafd487433238fd9 SHA-1: 21e4cf53cc774ae89837d2be96f0efa86a67f24d SHA-256: 3b76771c2c2967120850676363b92b4671c3c2b90cb5262ff293ecc7dc1fecca
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, with one prominent URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious purpose.

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://vilenefex.ru/strik?utm_term=best+riding+lawn+mower+for+steep+hills+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fd1eeb446b88.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/tom_clancy_ghost_recon_breakpoint_update_1.14.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/all_arms_tactical_aide_memoire_2020.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/how_to_i_verify_texas_medicaid_eligibility_online.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/54708919307.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/54854098950.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/biology_book_for_class_12_up_board.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fee866ecdc80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60290a3d888e4.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/locomotion_in_amoeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6013cbf374d53.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/ap_john_updike_theme.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/zotojedas.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/bivimesoviwodosomegedaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/jifowoxozegobep.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_c19adfde98b746019052b5902b56f6da.pdf?index=trueIn PDF document text
    • http://xotaferuju.myartsonline.com/mawimunudunowamopub.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_ef84b31f5d4d4659b52b102f27479a81.pdf?index=trueIn PDF document text
    • http://gujimosodaza.myartsonline.com/amendment_in_motor_vehicle_act_2020.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_c464eae911eb4e159dfdbed462bce7f8.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/how_to_get_gamestop_coupons.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_c9532543e9eb4c90b9a4856711e5171b.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_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 6076 bytes
SHA-256: 72fa59f3a58803a163eb2beabe39cf0944921e36f0ca6ba2df0128567a0b6f34
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 10680 bytes
SHA-256: f35f3f3ac161097748e358c29d6f56cedab80e09ed7f773cf39f4f0d7f94304d

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