Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598bac00d84c6f2…

MALICIOUS

PDF

100.9 KB Created: 2021-02-12 16:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 974fc26795824060662dc3c9f41e5e06 SHA-1: 2f4dce55a7a9873946ccd3aecec96e12305de454 SHA-256: b598bac00d84c6f28db17419216c2c0d448506187632bd1b5f9e69456423d997
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains a query string suggesting a lure related to 'how tall is david hasselhoff in feet'. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to potentially malicious sites or engage in phishing. No scripts were extracted, but the PDF structure itself is used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=how+tall+is+david+hasselhoff+in+feet PDF link annotation
    • http://kabosimoligobe.iblogger.org/23600834236.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/hrjhwhg/9037357873.pdfIn PDF document text
    • http://hyipinvest.site/xevetedowujm2su6.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/6724335.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/iLqagct/auto_mechanic_salary_per_month.pdfIn PDF document text
    • https://zuduberojep.weebly.com/uploads/1/3/1/3/131398404/xokowevanu.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/ge1hdjd/69706969803.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/0dheeSh/57285182083.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ajcs3hh/five_nights_at_freddy_s_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/bhfidj8/burger_king_near_me_now_drive_thru.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/62983668721nokr7.pdfIn PDF document text
    • http://bezprovodov.guru/giwodaresumetaxabagasedezfsix7.pdfIn PDF document text
    • http://unlockdeals.shop/thermo_scientific_elisa_technical_guide_and_protocolsie23l.pdfIn PDF document text
    • http://wiinorama.fun/ludovomags3yup.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/683538.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/mario_bowser_castle_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/timenezigetineg.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/notify_dataset_changed_recyclerview_android_not_working.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_off00014cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDE 5012 bytes
SHA-256: dbe89ce443519dcefbbff0fbe9839336c8e1dac728c484f3282a42e404d259ab
font_01_sfnt_off00015e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E04 12360 bytes
SHA-256: 894807dc74fcc35e84a4b908bf7864186e5b924b8cb8bc160928670cc0d9b9db

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