Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e9eacbb008f30b…

MALICIOUS

PDF

66.9 KB Created: 2021-02-25 02:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 71be9b6a751028bcb916d5cc672c8576 SHA-1: 1aab37bcf57dbec61427cd33c13cf2f264c01263 SHA-256: c4e9eacbb008f30b55ec1dcc555fb732453fca259eafe194dcf841d8dbea62ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to printer ink replacement, serving as a lure to direct users to the malicious URL.

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://bologen.ru/award?keyword=how+to+replace+ink+on+hp+photosmart+7520 PDF link annotation
    • http://norukirabo.iblogger.org/levidabo.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/finale_becca_fitzpatrick_summary.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/dbx_share_price.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/wobipiwim.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/nawuzotowinidudixofas.pdfIn PDF document text
    • http://rotosararazazi.22web.org/5862998943.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/the_golfing_machine_book.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/soleus_air_conditioner_window.pdfIn PDF document text
    • http://xosijitede.22web.org/sisoduzopomumegitamano.pdfIn PDF document text
    • http://tofuvuniz.iblogger.org/bikunalidewatadifebi.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/liwafo/colorectal_cancer_treatment_guidelines.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jump_force_next_dlc_characters.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/motuxagoxujefirunagovu.pdfIn PDF document text
    • http://ridexinawaje.epizy.com/fundamentals_of_accounting_principles_22nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/samsung_un50ku6300fxza_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/viwizipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/refatelaf.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_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 5768 bytes
SHA-256: afa536d2679bf563aa899b6b01a2345a9da646657ad7ef61f9630fddc5966c81
font_01_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10000 bytes
SHA-256: 077e4ef0353ae1cf80b70d10f10ec1b8acd53ddf84823f0588b6011a1ae8a900

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