Malicious PDF — malware analysis report

Static analysis result for SHA-256 f875fd81b9e489ca…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 03:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d20e07df1b2bc20bd1aeea3e25d0c66a SHA-1: c40ac5b566b144c9426421185ddbbcdcadbf76ea SHA-256: f875fd81b9e489cade7cb9c92e14ff902e6cd706340da2850af0c8ecc3a5e507
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://vilenefex.ru/123?utm_term=default+definition+eba+guidelines PDF link annotation
    • http://kesuvajeb.scienceontheweb.net/5528388571.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/wirifad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_6009547701244.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/27647353232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5fdfc0a4128e7.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/42467822368.pdfIn PDF document text
    • http://liolika-rsya.ru/38091084238bnycu.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/motorola_cp200d_battery_removal.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/business_continuity_management_book.pdfIn PDF document text
    • http://jumpfs.space/62473107287k509r.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/pedexojopufutepajikeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6017bb060b904.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/41647535639.pdfIn PDF document text
    • http://openchambre.xyz/monster_in_law_full_movie_123moviesuzhh8.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/13698904136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff1bcc0857a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_600e014526cd3.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/how_to_record_accrued_interest_on_income_statement.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/why_english_composition_is_important.pdfIn PDF document text
    • http://ch-redirect.icu/rifajolomulasizasufideuje1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_d7de2b417097455185ae2923b4a9a30d.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/pewulumugabokapaga.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_72c1b16818ac40eaa217a8a9aaf85c1c.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_da9520039644486ab8db3c9a0293dd81.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_c00be8f65066467798c6a6368f453c82.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_8f0aa53f39994de2bc8f9623e9ce39ec.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_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 5116 bytes
SHA-256: f09172efc104448b82198310bd949aafa5a627e800908ff747202f1a6319dbf7
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10732 bytes
SHA-256: b84d2c9ec2db97c6c2083603c7622d491273b9dff6b24229f79dca79ee939285