Malicious PDF — malware analysis report

Static analysis result for SHA-256 4499ad46b7c084fe…

MALICIOUS

PDF

89.8 KB Created: 2021-04-02 23:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bf50f4f35153b7e71b2efcc2c16d4c0 SHA-1: 10731b9d837e5aa360362c7afc369dce042b3de1 SHA-256: 4499ad46b7c084fefa2d758a15933b1ca3ec40475377fbc04d0351f85ad622d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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://seumenha.ru/strik?utm_term=which+states+do+not+require+helmets+for+motorcycles PDF link annotation
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/1067406.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/chcjbje/xapin.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/motidibotafotar_webarif_zafululisinos.pdfIn PDF document text
    • http://secret-empire.ru/nubosajobk20qk.pdfIn PDF document text
    • http://krokoboko6.xyz/how_to_clean_ink_cartridge_hp_photosmart_7520hn8k2.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/tedetigipoxu-meraku-xuxika.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/gefisiwulufomovakog.pdfIn PDF document text
    • http://robinmani.site/wadezelmimy1.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/22cd06d2d29.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/eGIhjhe/64955865518.pdfIn PDF document text
    • http://tehnotop.store/mobowogezewoborariw8x38a.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/dqojcjb/slang_meaning_of_piffle.pdfIn PDF document text
    • http://pearhaidhr.fun/jemadabur5bjth.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/Enmgfid/triominos_deluxe_uk.pdfIn PDF document text
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/belegakivevosilefoma.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/fikuxo.pdfIn PDF document text
    • http://grandov.pro/ponniyin_selvan_movie_latest_updatesg1pkm.pdfIn PDF document text
    • http://cardioactiveuficiale.site/does_autozone_do_transmission_fluid_changey36yf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_08ef3f7caa6d406b9a8c33b773a75116.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_97da4b41678f41ce88903341d876befb.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_57993ee845d742218430e063dd6246cc.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_0c755c348e414c6aba8b54d0a3ddefa1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 5500 bytes
SHA-256: e26bb53691f0d7b4eaa85ac121cce35a8535a511750b4f9ba217d0c833765d08
font_01_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 11236 bytes
SHA-256: 7c8044a376f86852fdc03512df2254a3da7a4b0c08bccae9971fe825eee0d7d7

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