Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2b2d88e4539ada…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 01:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 26d62808cc2f60a0b4b1c476a8b8e19a SHA-1: 64b14a31bba05c763f35e638cad728c61cbc5110 SHA-256: 6d2b2d88e4539adae9a90675abd584a11d3c8ad347cb418c42f53ecbe531b4b3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection service for malware distribution or phishing. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=british+vs+american+english+spelling+pdf PDF link annotation
    • http://mokaxizekebade.scienceontheweb.net/61880057280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_60282b48947d4.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/muxejexegapava.pdfIn PDF document text
    • http://prizinsta365.website/remington_700_sps_stainless_270_for_salee8oqd.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/jjija38/robux_calc_free_new_icon.pdfIn PDF document text
    • http://hotel-engels.ru/boulia_shire_council_road_report51sdy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_6043377ec746f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ffd6d8472ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6020f8e6c5632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_605b7bc5ad801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_601871c90c45b.pdfIn PDF document text
    • http://vknart.xyz/ielts_placement_test3g3qg.pdfIn PDF document text
    • https://cdn.sqhk.co/narivujuraf/hiaKD2D/digadopibupedoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_605073cacf6e1.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/97149619595.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/luropiw/25323555557.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/89680467163.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/assassin_s_creed_odyssey_fate_of_atlantis.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/fafojutovikorefip.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/42971531802.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/26756842391.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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5680 bytes
SHA-256: 0d7617a20b867b0eb0794a726ceb77c296d0e1aae7f1bfa3bb81c6d874077c55
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10992 bytes
SHA-256: e2d3904083328ae7d439b34c107c2c9d6ed4a6cedc7446c2cfb5af0b52baf81b

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