Malicious PDF — malware analysis report

Static analysis result for SHA-256 f766d4a88bdce75e…

MALICIOUS

PDF

76.8 KB Created: 2021-03-08 10:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e2f3edfed40023627bb7b27a24708d3 SHA-1: 0c2913a4b947bd39b5afa4b6e557c56be12ecd6c SHA-256: f766d4a88bdce75e7afe576fabcb1e2b5fd7306c285f93d58367fb8799024d23
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that redirects to a suspicious domain, likely intended to host malicious content or phishing pages. The PDF's content, though heavily obfuscated, appears to be a lure related to job descriptions, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=learning+and+development+manager+job+description+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5fccfb498e9d7.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/wezutulovivetu.pdfIn PDF document text
    • http://vemonubamupol.iblogger.org/nubaperijomovodumadek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fe2d0ed18260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_60459d10b8a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60155776ae03b.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://uploads.strikinglycdn.com/files/cec0f6a1-9b3c-401a-a360-10a371151ce9/93183093990.pdfIn PDF document text
    • http://zanipufikikuk.rf.gd/54003196012.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/93940580285.pdfIn PDF document text
    • http://bumosutu.rf.gd/71861485771.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/botines_plataforma_negro.pdfIn PDF document text
    • http://dekutob.epizy.com/yahoo_mail_apk_for_windows_7.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/13215874459.pdfIn PDF document text
    • http://putazosaw.epizy.com/a_commentary_on_kants_critique_of_practical_reason.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/lidenozuwinirakepexexixus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2716f4-63c4-45bd-b7d7-7345e51655e9/98058502708.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 5480 bytes
SHA-256: c3921f78bee6f045c10390afc9a627aadff4f29d5f9f3465f9c42226b2b5e84e
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10120 bytes
SHA-256: 4d7f8e2eecc4ae803446446df0f343a7f47370c20290b8585c5e52386cfae413
font_02_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.