Malicious PDF — malware analysis report

Static analysis result for SHA-256 890d8e241189dcd8…

MALICIOUS

PDF

72.3 KB Created: 2021-01-18 06:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c02296e9f010938e12ce581f45c982c2 SHA-1: db31c1c1b0efc393acc4d89ed58c3a1a29e2b0cd SHA-256: 890d8e241189dcd82c43bb0984d721619fd3d8b1c674879c0ecd90acbb274feb
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or malware distribution attempt. The document contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting, suggesting a link farm designed to funnel users to malicious sites. The presence of 'chicken tractor wheels' in a URL parameter and the authoring application 'wkhtmltopdf' suggest a potential lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=chicken+tractor+wheels In PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/wogus.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/144ff38f40c8.pdfIn PDF document text
    • http://salejozokaboruz.22web.org/77802127150.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/8713717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_5fd1d19b56a48.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/xoxebojizuzowekiwa.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/78c57079c2389.pdfIn PDF document text
    • http://xuvaguwanolinu.66ghz.com/fannie_mae_gift_guidelines_2019.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/vowokavisita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubolorira.epizy.com/murano_glass_value_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/2017_chevrolet_silverado_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/paulo_coelho_libros_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/football_pick_em_sheets_week_7.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/lijit.pdfIn PDF document text
    • http://totiwofosu.epizy.com/17929909948.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/buddha_hoga_tera_baap_film.pdfIn PDF document text
    • http://tujiritam.epizy.com/66856044121.pdfIn PDF document text
    • http://rawuwad.epizy.com/national_glamour_day_shopping_guide.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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 4948 bytes
SHA-256: 77640ab0f8bae097b97794ea739f2b8f3c1b11c2557504372c742b82bd1ddd65
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 10880 bytes
SHA-256: f93b899ed5943649ed2c6b79f8ad7114ce3d7fb8856e7d54a36dc804d47ee721

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