Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd33550ba33d693…

MALICIOUS

PDF

80.3 KB Created: 2021-02-26 03:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 89aeaeada1a57a70ff9bb1ff2c7467d9 SHA-1: 9362564cd4a485c41af274fde3223b64eee69c39 SHA-256: cdd33550ba33d693f37a7f615c0d978a83b0bf89edd91ebc5bc15bb0dce6cbcc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with the primary one being 'https://leonvi.ru/award?keyword=vizio+e371va+won%2527t+turn+on', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a link farm on disposable hosting, reinforcing the malicious intent.

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://leonvi.ru/award?keyword=vizio+e371va+won%2527t+turn+on PDF link annotation
    • http://homiak.fun/riguropiwosudafojawocfcrz.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/doxikitx3mba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_60220bab0262b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd6718bc2b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_60361fee5db03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_5ff5313ed5197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fd293f3a902a.pdfIn PDF document text
    • http://br1.red/verakelw9eep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_601b61a40f29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_600e5376b89c0.pdfIn PDF document text
    • http://com-signto5.xyz/angular_use_variable_in_template1phmb.pdfIn PDF document text
    • http://8gusevshop.website/448746828325qdw.pdfIn PDF document text
    • http://hugertely.xyz/ancient_egypt_cities_informationwtr3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5fcccea808891.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/pugomonapoxuxe/19395910559.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/23221716236.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_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 4964 bytes
SHA-256: 13097d8c572ebfe54f98de492869123cd2cbdfeffb1f0db7b9a9f70f190a1112
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 11620 bytes
SHA-256: e751e882b2187276f22967fd7a2a66aba49ad665b3a2d598a4d8c08939753aeb

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