Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fc33bea5dd2c79…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 16:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f5adb1c850b91f18b4ae0d12bd26ca5f SHA-1: 6331b2cf9d26b0a4570417dbfe49c9a5c8a286ca SHA-256: 72fc33bea5dd2c7978466f87ff24d6688edf380a69aeee18c6f13a4bb0cfe146
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=rsu+74+budget PDF link annotation
    • http://zagavogafewakud.iblogger.org/78128984878.pdfIn PDF document text
    • http://agent-ritual495.online/what_apollo_interface_should_i_getyx6zu.pdfIn PDF document text
    • http://reduslim-italia.website/tudexdrd6g.pdfIn PDF document text
    • http://raffle.website/vojabufupoxezejarantvez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_600cf5432910e.pdfIn PDF document text
    • http://arendaavto.taxi/51314357507onfy9.pdfIn PDF document text
    • http://rukozhop-guide.com/canon_dc_comics_meaning66bas.pdfIn PDF document text
    • http://reduslim-ordina.site/when_does_delta_hire_flight_attendantsxo4db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60153ac5306c1.pdfIn PDF document text
    • http://savagaruzegiw.iblogger.org/sas_ods_rtf_page_break.pdfIn PDF document text
    • http://svoylend.xyz/matched_ally_condie_sparknotesannc7.pdfIn PDF document text
    • http://sluzhba1.net/williams_wall_heateroe7ns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_604353719d2c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_603aa41d2241d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e33629-165f-4b3a-a22e-ee2767a5026b/silemuzuzuwo.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_6a9157b58fa74510b502d3a0ea288f4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91c2eee-613b-4cf4-9733-459e404cd591/vabatafida.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_9a1ccbef3f9a4fcaaf69424751335931.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_a672ba07460a4fe4b777429040c5e248.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a751e68-bdc3-4f7a-a629-8803b2f53912/99896185750.pdfIn PDF document text
    • http://tarexokugizizo.epizy.com/24933597853.pdfIn PDF document text
    • http://vumafovixono.rf.gd/series_and_shunt_voltage_regulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb20c59-ec5c-4ecc-a7a4-cc96f4d1a0e1/49849435010.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_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 4972 bytes
SHA-256: accdff216d9309f5ef71d07c018aa2161551a0b6bb635c4a5624e55480461ee8
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 11124 bytes
SHA-256: e682231543c0270c7a453528fe83fb3f146581e3d0a49fac2c51364ebe6c4f80

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