Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c65d1275821f6e3…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 10:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29bfeae1a9c27399421531b4c98fb10f SHA-1: 76963ac84acf26e756eda7c02fbdb0b0a4f918b5 SHA-256: 6c65d1275821f6e3221fe5fa581f9908f6bfdcba9c98c064c321a73256c8c425
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to obscure the ultimate destination. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=fitness+insanity+resistance+band+workout+guide+pdf
    • https://cdn.sqhk.co/rufopunuk/Fhb6pgz/wrebbit_3d_harry_potter_hogwarts_express_puzzle_instructions.pdf
    • https://cdn.sqhk.co/zosiwutu/dvOGDij/52924317502.pdf
    • https://cdn.sqhk.co/lajoroteb/BRmEidL/lucky_lanes_bowling_prices.pdf
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/wegirozo-gogiloviwolin-gurasafosaguduj.pdf
    • http://zamuxodub.22web.org/liquid_template_xml_to_json.pdf
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fcaf2014e8bd.pdf
    • http://faxozulakevosos.iblogger.org/squat_university_piriformis.pdf
    • https://cdn.sqhk.co/xeloxilava/xs5hgNd/50697386748.pdf
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ffb27b4b0202.pdf
    • https://cdn.sqhk.co/tinolefowi/f4kl9hj/32197441471.pdf
    • https://mupilikonibiz.weebly.com/uploads/1/3/0/7/130740066/rarewef.pdf
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/2091644.pdf
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/sunijeliva.pdf
    • https://cdn.sqhk.co/niramojiga/DhjkFue/gooz_io_hack_apk.pdf
    • https://cdn.sqhk.co/visesefider/d1jhhj2/citrus_tree_new_leaves_falling_off.pdf
    • http://dijuvilojo.22web.org/remote_answering_service_jobs_from_home.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_a43fa0c67bff40889cc816e785d3b796.pdf?index=true
    • http://gugogedufos.epizy.com/o_capitalismo_para_principiantes.pdf
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_a2169e663d9d4e76a82899204dc9328c.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_31fc775172f4427a80d82b4818876267.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_588f0c43304f40d5b572fe526d2a3729.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47c.bin
540cfe0599e23ff34654501cdb1721568f302e0f2c361003b2c9d8d64bc5061c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 5644 bytes
font_01_sfnt_off000107e2.bin
28c773262d1926c40949344a1e71de2dee25388064b1912b699f712e0cead758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10520 bytes

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