Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4f0c879f8c893a…

MALICIOUS

PDF

72.9 KB Created: 2021-05-10 18:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8532e24fa2bebd4d035ec44b84f35510 SHA-1: 523dd1a5a4e68198a705b42c700f8f6ea9ec196b SHA-256: 4a4f0c879f8c893a5181c28179256b0b39bd9ec8d10174de98fd4d777f2e4490
126 Risk Score

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 0.9996

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://jumiwimov.ru/strik?utm_term=diffusion+of+innovations+google+books PDF link annotation
    • http://fredo.bike/archery_contest_kingdom_come6qs8n.pdfIn PDF document text
    • http://ryukzak.digital/mogitomasanarokofuvebid4jgn.pdfIn PDF document text
    • http://summ-ita.space/rutejowatibomerijejufasl5efm.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/10349547615.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/28065782920.pdfIn PDF document text
    • http://sallles.ru/9593633806ef2yw.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/eZhaVij/callaway_golf_set_costco.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/1964203022.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/UXjbie6/apple_music_ringtones_android.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/esggDgh/5632747506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_0845d0e106ae41cdbeebd37d1b5afb88.pdf?index=trueIn PDF document text
    • http://lesesopexapawu.rf.gd/22234929529.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/accelerated_shelf_life_testing.pdfIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_f26e932465374a08bb5d19ccc768941c.pdf?index=trueIn PDF document text
    • http://vonubopoz.rf.gd/wikunimimufew.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_26c7e35841df4ba5a1a4e4983ac69e07.pdf?index=trueIn PDF document text
    • http://vepiwebime.epizy.com/mebofekujigi.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_bff0ce967e8a4237ab968463824ca9ed.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_396c66c5b0e0410db1bb65cf8eb46fb1.pdf?index=trueIn PDF document text
    • http://jidaxel.rf.gd/vesanogobewivenawoveji.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_d35f80b725244bfa8cfba6aba7ba8754.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 4984 bytes
SHA-256: 9aa1508e68c7bab37f570ae8c75ca4cb55c8811cc44bb491061ef6a48d68916c
font_01_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 10368 bytes
SHA-256: cdeeaf34d40933a56111448c962da1903b7bb32d05c55ebc50abc8635c78a321
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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