Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a259b8f70dd994…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 00:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc0e5d74862f78c9ec092b84888bcad5 SHA-1: 78deb28e6765c7441c8942f2bb094d5abec2560d SHA-256: 55a259b8f70dd994c7cc61c12fd4143111c2925e485c36027d2ab3922ac4311f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs pointing to disposable hosting and uses SEO-related terms in URLs, suggesting a tactic to attract victims through search engines. The document body, though heavily obfuscated, appears to be a lure related to creating forms, likely to trick users into downloading further malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=make+checklist+form+in+word PDF link annotation
    • http://fc-aromat.ru/why_18th_century_is_called_age_of_reasonpx6lx.pdfIn PDF document text
    • http://igme.site/90098588714w0eum.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/operaciones_combinadas_con_fracciones_resueltas.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/1fb3a953d9b89.pdfIn PDF document text
    • http://muzoc.xyz/kupukozinatusiravumivagigd355.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/baby_gate_for_stairs_with_railing_on_one_side.pdfIn PDF document text
    • http://detonic-deutschland.website/133480362497ypp.pdfIn PDF document text
    • http://rimka.xyz/820998451023n110.pdfIn PDF document text
    • http://latuha.com/nike_air_force_1_white_low_toprz8gd.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/23856112273.pdfIn PDF document text
    • http://pitushok.fun/481091166931fgvc.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/d9e0dba42cd5c9.pdfIn PDF document text
    • http://zootime.store/kuduneka2pggt.pdfIn PDF document text
    • http://lorenbayi.com/how_do_you_know_what_generation_kindle8vmlf.pdfIn PDF document text
    • http://lalashoppen.online/command_in_war_martin_van_creveld7vuvr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58235dff-d974-458c-92d8-cc238204a64f/garmin_zumo_660_charging_battery.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/tu_puedes_sanar_tu_vida_resea.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_7fa79fc2527046d4b520fcd9eff023aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/681bdcf0-1bf9-40b8-b28d-5902e28cfed1/portrait_photography_lighting_setup.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_5594a0a9c45f4de5bbc376a0972b11ca.pdf?index=trueIn PDF document text
    • http://ruronegiseko.atwebpages.com/grade_9_biology_textbook_download.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_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 5420 bytes
SHA-256: e0070f91015917075bcf6fe7fcbcf6674fbab22e1c33abaed8fe73108e9969e0
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 10508 bytes
SHA-256: 4af67331453697e8d63f3e9f8eec3d596fd1477b7db4dcaf05356a85ed8f1721

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