Malicious PDF — malware analysis report

Static analysis result for SHA-256 f390bd93104cf8c7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 18:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a95dd369e159f287c1977d376be39132 SHA-1: 1b2ed5f67c97b5f154e45a673e7bfb776f31cfdd SHA-256: f390bd93104cf8c7702df9bad9b17300a29721ed0f4e4dc4a18a9ff81128fb0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/award?keyword=cours+excel+2020+avanc%25C3%25A9+gratuit+pdf PDF link annotation
    • http://wivikaxebox.medianewsonline.com/gogotojudisodakum.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/wuwelozawitilaw.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/newibujiraw.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/2915566.pdfIn PDF document text
    • http://xuxoxobu.iblogger.org/hemiplegic_gait_analysis_form.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/howard_leight_impact_sport_bolt_electronic_earmuff.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/86751422330.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/carl_jung_dream_interpretation_book.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/first_alert_smoke_detector_9120b_chirping.pdfIn PDF document text
    • https://jixinedoxe.weebly.com/uploads/1/3/1/3/131383771/4455226.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/3178118.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/gcijjn6/28966761076.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/research_interview_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/shhJhhp/kulivoxapinegefit.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/herFtyE/ihealth_pulsoximeter_po3m_air_smart_pulse_oximeter.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/713031.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://sosefamip.epizy.com/senoxavowaxozesinuvozagu.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/breve_historia_de_los_estados_unidos.pdfIn PDF document text
    • http://gujomodezeroj.epizy.com/82128817141.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5772 bytes
SHA-256: c7ea7ebcc410481650e1c302dfbc8659fd769d52a830c908bd845604b826b9ee
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 12104 bytes
SHA-256: 2df4a4a806a9179ce62b181f83cc32c6359961474bd700b31aff914682d6bce0
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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