Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c56c4fa9f17f0…

MALICIOUS

PDF

73.8 KB Created: 2021-04-05 11:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 009cfe8741eac13e3493fe7bc121b38c SHA-1: 911f2192d163b2a629d2d2b0412a1596e6d8acb8 SHA-256: 868c56c4fa9f17f03a1f6fd246be63f64577d1175fd9709a90fa9d7fe33021ff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious payloads. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', suggesting the document's primary purpose is to redirect users to other sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs are the primary IOCs.

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://leonvi.ru/award?keyword=chief+business+development+officer+job+description+pdf PDF link annotation
    • http://jofarofuwudeveb.66ghz.com/absceso_perianal_manejo.pdfIn PDF document text
    • http://datinge.site/hardboiled_eggs_ovenjeiuc.pdfIn PDF document text
    • http://bilkaita.space/how_do_i_prepare_for_my_drivers_testsnpdf.pdfIn PDF document text
    • http://smartcoin.design/wugepamonidojopevipugitemsjvc8.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/little_baby_jesus_arinze_kene.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/que_es_el_estado_de_derecho_peruanoo7a4g.pdfIn PDF document text
    • http://ekzo-fruit.ru/fusitasak05sat.pdfIn PDF document text
    • http://mmuuue.space/sunalijrqzk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_1affa8e2037847d192d5b577d0a97b97.pdf?index=trueIn PDF document text
    • http://nabunuwo.epizy.com/bukokupav.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_92475cd271874677845e9bd97ac0e5ad.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_4fa5889e2ae145d2bd185e4c8cfc47cc.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_4caadb7f92f744f0837e3591cc332756.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_9f67c6477e8e4bd08dc87ab50743f92f.pdf?index=trueIn PDF document text
    • http://roraxekabitapoz.rf.gd/what_should_my_5th_grader_know_in_math.pdfIn PDF document text
    • http://pawupokativebak.rf.gd/14327489979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d11a9af-ede6-4f3b-99e4-f9776c4b2f47/ipod_nano_6th_generation_does_not_turn_on.pdfIn PDF document text
    • http://dodavofonov.rf.gd/zajukituf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00350b7a-3944-423b-8c29-30021dc42569/tom_clancys_jack_ryan_season_2_episode_7_imdb.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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5364 bytes
SHA-256: a984304132e0889f5a7ef2e6aa6752afae0e53a0569fa3c4ac71837b8dda3a69
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10688 bytes
SHA-256: 7552abbab58827fe8814299a44bfadbfbd080b8baf8d3efb254be9f9ae3d14a0

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