Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b59b62e2a751b3…

MALICIOUS

PDF

72.2 KB Created: 2021-02-28 22:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7e01715a5a066ad583a54a4cd768fa7c SHA-1: 80b3f10cb5669cf753c1b10b5151e47778cfd9e6 SHA-256: c4b59b62e2a751b34d10f57e0a4262b0ad9c279bb88a69ffb3a4b3143c0fc6da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=what+happens+if+you+lick+a+lizard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fe9d5ec414e5.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/jiia5Wg/telonewevuwutuje.pdfIn PDF document text
    • http://gevejune.iblogger.org/15640590007.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/ehgjehT/kosirokuboz.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/iiihige/tabuliji.pdfIn PDF document text
    • http://wapazezaduv.iblogger.org/isaac_newton_academy_ofsted_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_6019fccff3e04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5ffe83e223310.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/gigigjg/word_on_fire_podcast_itunes.pdfIn PDF document text
    • http://tubixiwuwura.iblogger.org/integrated_writing_toefl_ibt_template.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/Qgjxib5/wogulegedorekezurus.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/bgiDQGB/nedofoxumev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepebejawu.epizy.com/adding_positive_integers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/metformina_850_mg_efectos_adversos.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/bmi_calculation_excel_spreadsheet.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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 5472 bytes
SHA-256: 4297825308890bb1fecff0e04fcb9f3715b4423a5a8e0d1de7bf0d18868c7b6f
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 9936 bytes
SHA-256: 92e65ff44096daf9f46871a1352b66f4c891b5b12c8defbffd65c9de3c6d5cb2

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