Malicious PDF — malware analysis report

Static analysis result for SHA-256 789442e78b56c802…

MALICIOUS

PDF

76.8 KB Created: 2021-06-12 10:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: abb5621b0c88eedaef34058976fd0484 SHA-1: cf331e87e89a98041454304bec7aea65404d5dbf SHA-256: 789442e78b56c8028287aee1628a2e857c5af3fa8d940520a2661ee534aa7465
226 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a large number of external links, suggesting a link farm or redirection mechanism. A critical heuristic identified a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. While no scripts were directly extracted, the presence of a lure and external links points to an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://huntic.ru/pbw?utm_term=voice+recorder+pc+windows+7 PDF link annotation
    • https://ronixokom.weebly.com/uploads/1/3/7/5/137503325/lifomosoxoko_nisusufena_tufeferuxokaz_kixiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_601fce7b27328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_6068c9b9c93ca.pdfIn PDF document text
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/viraxos.pdfIn PDF document text
    • https://zogoxakemu.weebly.com/uploads/1/3/4/2/134235374/nutelefib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144630996/the_norton_introduction_to_literature_portable_12th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d51e3a-8a62-4b3f-81bd-eadf277d6ac5/21915836524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3d17aa-b6d3-4615-9795-db59db0121dc/tofinadusid.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/past_continuous_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f27e6a-c9d3-40be-b50d-761c604cc2a9/how_to_get_religious_exemption_for_vaccines_in_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea9b632-11cc-48ac-bfcb-3ffeaa30197e/buruw.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144702801/practices_that_support_diversity_equality_and_inclusion_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1802e8bb-e65a-4406-9980-3c9404fc6c58/programacion_neurolinguistica_costa_rica_cursos.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/jebuw.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/fallout_3_bobblehead_location_map.pdfIn PDF document text
    • http://betifabito.pbworks.com/w/file/fetch/145171536/53939788655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4785f72e-29dc-4e09-8bd5-aa258eafe070/fox_sports_go_app_bally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa70f2de-362c-4c95-897a-24f8741ca42f/sta_rite_pool_pump_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4856305c-cb14-474b-8c54-3b5a59422950/nutejikigogivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab176d8-bc9b-4e4f-987c-0b6427f12c81/what_does_it_mean_when_your_moon_is_in_aquarius.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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 4960 bytes
SHA-256: 4ef144cbc145ba472ad933120bce0bdbf24d805e186cead01a3a92425229e625
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 11468 bytes
SHA-256: 9e19b899dfb127339ddbdc067b45d307a03efaa0474574ed703ee1aa2af201ca

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