Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac9c7dfec0f054…

MALICIOUS

PDF

68.6 KB Created: 2021-03-23 15:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d155942586f71d16e3c2b316decd533 SHA-1: b9828e0b93893ae6daf05b37033a4a928b574712 SHA-256: 81ac9c7dfec0f054634a71a61dcd7b8db572fb675ed75e3d1833a8e616343472
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/award?keyword=jurnal+tentang+alelopati+pdf PDF link annotation
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/99c462b71ba.pdfIn PDF document text
    • http://josuwuwopow.22web.org/easy_trumpet_sheet_music.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/98ceb624d.pdfIn PDF document text
    • http://pelistens.xyz/one_punch_man_anime_season_3_release_datejonux.pdfIn PDF document text
    • http://namixojebeku.iblogger.org/call_recorder_free_for_samsung.pdfIn PDF document text
    • http://mylic.ru/android_portable_battery_chargerb6f3s.pdfIn PDF document text
    • http://securityverifiedservices.com/georgia_drivers_license_number5dmt8.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/0a1e2291.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/washington_dc_metro_map_download.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/gifagixibivazibigojasi.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/wezuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusevim.epizy.com/20866156938.pdfIn PDF document text
    • http://rabuxudizuxu.epizy.com/kunupubuxewumafalemefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dfa268-2c4e-4225-b51f-d5ed7ff1aea1/97364973620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d78e44-00c0-4039-ba17-4b4ee315c555/how_to_remove_lg_air_conditioner_cover.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_e2d55ac2b31f44fd92c4eacdcc5228c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1938436-ef6f-46b2-96ea-fa5a921ac7e2/fimuwofuzupu.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_db93c4d9ce84465cb77641d1fc5af44e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13df15b9-6939-435e-83cd-a06873387ca0/como_hacer_un_estudio_de_caso_de_familia.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_4657b827a4fd4574a2513437329bb77e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/256551af-9008-4df4-a84c-d5eca7d99c1a/wekogaxoji.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 5020 bytes
SHA-256: d0fe9fe94ee8135f722162352c3b5a686b36eadce4ffb6363cda555383b08f38
font_01_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10280 bytes
SHA-256: 1671e196c229c42a77d5b8a20d9d6a62a46f49d178437e9be544569cb991576f

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