Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbca005e8787b6f…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 17:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f81620ddbc4a4c8c98509564b476f32c SHA-1: ed54d2c1dbdaa5f368d2f1dce9bfde07bb171164 SHA-256: 9bbca005e8787b6f3eb9887ad11b1761dbf4b011b146ed12899f6b16d7549dcc
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9990

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://dugedepap.ru/award?keyword=palm+reading+books+free+download+pdf PDF link annotation
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/nutanixozu-sitixoniken-zexejuzimore-nisifezijilajof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6014901ee333f.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/364bfc134d08.pdfIn PDF document text
    • https://ginozupil.weebly.com/uploads/1/3/1/4/131411281/nimonililuveti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff2249fb9d87.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/avg_free_antivirus_definition9xw9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371505/normal_5ffe81b804b67.pdfIn PDF document text
    • http://starkrobotics.org/cv_sample_format5q8nk.pdfIn PDF document text
    • http://extraterrestrials.space/how_to_remove_gas_hob_knobsfekxu.pdfIn PDF document text
    • http://ludoritepiru.22web.org/weezer_africa_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fe496de950c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_6058ccd8ca8f3.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4451352/nIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_4e5d108a649c4b36ad6129eb63d058a2.pdf?index=trueIn PDF document text
    • http://begalokatixatu.epizy.com/gitobufogumix.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_b82d430f5d0f4942a10eb4bccb14ce96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/xufiwawivubepakejo.pdfIn PDF document text
    • http://jatogotela.epizy.com/jk_bank_books.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/68393019924.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_5cd95ac9104f47e0b7962ebf27c0d28b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/negateru.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_028c9a7fed2c4355a88e62d711f32be3.pdf?index=trueIn PDF document text
    • http://kunubuxeduw.epizy.com/how_to_do_echo_command_in_cmd.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/83412352294.pdfIn macro / runtime command snippet
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_13c30af0c5c144ad8608ea4f885d79d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/beamng_drive_full_game_for_pc.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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 5660 bytes
SHA-256: b6286c6093b3caf78a3636a8167fef76eb84fbfa6fd1d6d5e18805780de6b77b
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 10604 bytes
SHA-256: 6794da03e4c3e5039824967c00e2a6d777872fe9687af556ad548b8827ddd888

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