Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac378fc4935c8b…

MALICIOUS

PDF

69.6 KB Created: 2021-03-30 20:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b90b8349964d135dd92259073711e4db SHA-1: 12064b0fda110ee2fc921984b14b6b4edab4cd7c SHA-256: 86ac378fc4935c8b6dc788214474c1003e5bb4fe8743f1b70dcfef5b7d4d176a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://zajinet.ru/wix?keyword=auxiliary+verb+worksheet+for+class+5 PDF link annotation
    • http://vasakuso.sportsontheweb.net/xifemitapunak.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/bienes_y_servicios_con_tarifa_12.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/iapTiei/86619788611.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/bafok.pdfIn PDF document text
    • http://mysteps.online/xasudavuwonajizobidesjf57s.pdfIn PDF document text
    • http://lnstagramaccounts.com/best_funny_videos_download_teluguo61q7.pdfIn PDF document text
    • http://trynon.xyz/897742866511mphm.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/91333328943.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/btgh5u7/big_bang_stars_now_and_then.pdfIn PDF document text
    • http://domainlimax.xyz/8048930528vtlbw.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/what_comes_on_a_burger_king_crispy_chicken_sandwich.pdfIn PDF document text
    • http://tronreserve.online/digomisakojeguvc17rc.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/Rhhhh54/fodder_calculator_handy_tool_for_summoners_war.pdfIn PDF document text
    • http://cafechorsu.ru/haier_washing_machine_9.5kg_price_in_indiac7j70.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/alt_number_codes.pdfIn PDF document text
    • http://glossywp.online/denedudinajogokakato0l9z8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowimirozox.atwebpages.com/nafajixogoxiku.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_ec70e3b122e54ecab1ebc5e10c172a5f.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_6f582d59eeb24a9790d0d355ed79b4b7.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_878076458962440394a427f49a80b569.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 5608 bytes
SHA-256: 747ef901f6aa3dab708d2a42282da20796f0b2087538fb33e2b749caeeef6dfe
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 10412 bytes
SHA-256: c6cce81318fc15a0375d309b9239acd367d687e2cffd609b2d1d98e7ecd1e05c

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