Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd83225c0f58450…

MALICIOUS

PDF

89.4 KB Created: 2021-04-09 21:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09675f90537b6efced8a7a90fb401b38 SHA-1: 56ba87610ac59441087a81f99d894fc46d951431 SHA-256: 6fd83225c0f58450654176b9d2c6d4fdee32c43cf7cc9ca701c37ec6e5712c6c
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of an advance-fee scam, leveraging a lure related to a popular book summary to entice users. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=diary+of+a+wimpy+kid+dog+days+book+summary
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/tatisupazagopevuxe.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/xanebususe.pdf
    • http://wutanumijejol.sportsontheweb.net/19578464246.pdf
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5ff01ad469134.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/bobijefodewu_dazobadi_zatobolevuf_nixikutebobege.pdf
    • https://static.s123-cdn-static.com/uploads/4370268/normal_60029e763ce08.pdf
    • http://luwogexejel.getenjoyment.net/mafekazavijovazibuni.pdf
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/bukogetitisavig.pdf
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fd2a2207ad18.pdf
    • http://xeberul.mywebcommunity.org/succession_planning_best_practices.pdf
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/jakaba.pdf
    • http://lalikexitaxixix.getenjoyment.net/libros_para_aprender_coreano_espaol.pdf
    • http://dadevizevarek.scienceontheweb.net/how_to_set_up_cards_against_humanity.pdf
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/nosenixexelurikilet.pdf
    • http://pusikoxelumide.iblogger.org/59847109969.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_4bc0f10dd5be4bf0866b6054a753da28.pdf?index=true
    • http://muvemaxadal.onlinewebshop.net/91010917734.pdf
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_3038cd2a2692484bb5860ba9fb6d1279.pdf?index=true
    • http://vogojitipam.epizy.com/wugowumifukiwobopiduwex.pdf
    • http://pevogikuxupeja.onlinewebshop.net/kunedobuvojikisudukob.pdf
    • http://lojanapijavavo.rf.gd/a_touch_of_class_limousine_company.pdf
    • http://sagaxuwesik.epizy.com/roluronis.pdf
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_2f33a20068e843a7958565b98de99423.pdf?index=true
    • https://576979ff-f939-4980-8793-4b7993fae0a8.filesusr.com/ugd/14903d_17e6d3310a1c403099175e176ee45d7d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b11.bin
13f8b40babcd8b85f29f446698e9a18fd1a8ce3111a7f7fcd52c676ce89abf87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 5728 bytes
font_01_sfnt_off00012ea1.bin
ecfb99a23d4b4097299fd365d1d08fc7f4ca42574ef280ec7fa8c7368b06b58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 12456 bytes

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