Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9f192899d581aa…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 06:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3c55a684f5b5401bb1b3b79195f03431 SHA-1: 4db5ef5837739fe370f990ae6235cce9a0434739 SHA-256: 8d9f192899d581aa933da3ad61c4ca2157d8d9a2c72bb56d4fca374628299ac5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting and link farms, reinforcing the phishing or redirection attack pattern. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure suggest the PDF is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=2002+ford+windstar+repair+manual+pdf PDF link annotation
    • http://antonio-ita.space/libixogunipan0mjs.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/kamus_terjemahan_arab_indonesia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff24d34e12d6.pdfIn PDF document text
    • http://matras-24.ru/how_do_you_check_the_charge_on_a_citizen_eco_drive_watchu727g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6021e97465c63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6000ac5df09f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_60296e6614c20.pdfIn PDF document text
    • http://pitushok.fun/what_is_the_ufc_weight_classesyj548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fc7d2f8caa0c.pdfIn PDF document text
    • http://espaceabonne.com/ot_frame_of_reference_listpx3a8.pdfIn PDF document text
    • http://accface.in/glossary_of_records_and_information_management_termse71ms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_6031910d862a0.pdfIn PDF document text
    • http://youla-24.cc/52008545146wbs9v.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/cG4Zkk3/skinstore_referral_code.pdfIn PDF document text
    • http://nudistoff.club/intel_high_definition_audio_driver_windows_10_download_32_bitn3ws1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5ff5da0c01bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_60373a316c941.pdfIn PDF document text
    • http://workmonster.net/jijapupusonewobisou1m16.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/64934402579.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/anexo_3_icao.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/dzUjjhd/limixinutolaxotifosevipas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minivenema.atwebpages.com/samawaropewimu.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_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5460 bytes
SHA-256: eebdc79b983d31e412ce77b84f9965bb38764063aa62afddc1e90c2286ede15d
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 14416 bytes
SHA-256: ea68255cf79e540cf716eb0805adbf0714dda35a05d00f96e5c9946400fdbbe6

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