Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbdc24f58039169…

MALICIOUS

PDF

78.3 KB Created: 2021-03-26 08:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8ea793958cad3cb3df081ffc8e3b2233 SHA-1: 40a266ed152c16de79124ee7a98624dcfe310f59 SHA-256: 1fbdc24f580391699caaf64e6cfdd2941ab92004daba68895c4ffdd407445ff0
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL observed is https://jumiwimov.ru/wix?keyword=environmental+science+chapter+3+test+study+guide+answers, which is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/wix?keyword=environmental+science+chapter+3+test+study+guide+answers PDF link annotation
    • http://rakuxijewimafud.22web.org/20235811422.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/4njeDhh/second_conditional_exercises_with_answers.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/b1509f4696b7e32.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/why_isnt_my_roku_remote_control_working.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/eiahdBW/90289421887.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/61Ghiii/jiwugimemile.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/PiaePG9/cops_and_robbers_minecraft_server_xbox_one.pdfIn PDF document text
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/sebuf-mewojedo-vidivi-gidividutanizez.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/dhce5gh/79598025036.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/wozojewex.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/entrepreneurship_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/tjYYhiP/top_up_free_fire_5_diamonds.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/31943958895.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/papab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivifukejipuwa.epizy.com/how_closely_does_a_discovery_of_witches_follow_the_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cc6636-f349-401d-bd67-f345ebf04d92/army_m9_combat_pistol_qualification_standards.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/pendidikan_agama_islam_kelas_xi_kurikulum_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffc87e4-d45f-4107-b79a-0c6f0e5c1823/python_machine_learning_tutorial.pdfIn PDF document text
    • http://xumidexasij.epizy.com/john_deere_mowers_at_home_depot.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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 5864 bytes
SHA-256: 961c0fb97c5d63d0f0dee84522c57d6ebff0461c4c56e322c7e28aeb696ca854
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10844 bytes
SHA-256: 52860997be729bbb63e316eba4823a4bd720a85cc68375478ed2f55295afb012

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