Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0b4dc8a0500fa6…

MALICIOUS

PDF

86.0 KB Created: 2021-04-06 15:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8c295cafcf840b3024c4b96f85f69a46 SHA-1: 1153847f3d995902928e4af22c3f9f99a5b7b306 SHA-256: eb0b4dc8a0500fa6d9aa1802d13bdb43c0706e9c2874849e0957310f53f88997
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', and the primary heuristic points to a URL that appears to be a lure for downloading a 'ntn bearing catalogue pdf free download'. No scripts were extracted, but the presence of many external links suggests a phishing or malicious redirection attempt.

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://fokemale.ru/award?keyword=ntn+bearing+catalogue+pdf+free+download PDF link annotation
    • http://vezokikawelin.iblogger.org/nice_guidelines_intrapartum_care_2016.pdfIn PDF document text
    • http://zosujobitusup.iblogger.org/75542383762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_605c174bec95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_602fe12667622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_606896ba6d9f0.pdfIn PDF document text
    • http://zajozin.22web.org/baritone_ukulele_fretboard_diagram.pdfIn PDF document text
    • http://vuwomozux.iblogger.org/12512616228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc8311b88328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fcf66cfec147.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
    • http://putudodizisag.epizy.com/child_language_development_stages.pdfIn PDF document text
    • http://nepafel.epizy.com/ejemplo_de_dialogo_persuasivo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/butusikevevolerejo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/reporte_de_incidentes_y_accidentes_laborales.pdfIn PDF document text
    • http://mawigugu.rf.gd/hierarchy_of_human_needs.pdfIn PDF document text
    • http://punegejofuj.epizy.com/4463783637.pdfIn PDF document text
    • http://zuwemanikipe.rf.gd/how_much_does_a_international_business_major_make.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/science_teacher_interview_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5228 bytes
SHA-256: cf78a67ba22eda0912f498c9b8602c61ff99a4ef401f52c8073ececc301d67e1
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 11140 bytes
SHA-256: 5b008e630c40dad6a8f32ba184a0cdd47643bcf3d07fd91b705a4e4ca9d9aaa1
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16088 bytes
SHA-256: b5f1397982530d9e987604a9fc8467d56fd147c09520e12e54de27667870b356
font_03_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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