Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfefd60480b2ee6…

MALICIOUS

PDF

90.5 KB Created: 2021-04-02 10:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ec2a8da7cf7a25023fb9b88b7476f90 SHA-1: 3325915849bb84c222becdc4cf61d4038227c9e7 SHA-256: 9bfefd60480b2ee649da5a3714df71760fb453a23c8db3438e019d6ce858a593
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://nipisod.ru/123?utm_term=bcom+full+form+name PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fd0861280c16.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/canon_pixma_mg5320_wireless_inkjet_photo_all-in-one_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/ebIhg0E/eat_then_throw_it_all_up.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/omnisphere_2_library_size.pdfIn PDF document text
    • https://cdn.sqhk.co/pupoxobumake/4hgPgeS/banshee_saison_4_vostfr.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/analytical_mechanics_cassiday.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/medicinal_plants_in_vietnam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_600af0d903348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_602e3bd9bd3ba.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/pevitigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_6064e743ca1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_604ebc3b34812.pdfIn PDF document text
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/178141.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/wukux.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/distribution_binomiale.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/historia_del_estado_de_mexico_desde_la_epoca_prehispanica.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/78662728273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desujiruvomeb.myartsonline.com/71956551660.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_5d0b7629d1c34ee599eaacf90ed6cbec.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_053e89b792fd49f18b88d92a2ef9dd7c.pdf?index=trueIn 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_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 4900 bytes
SHA-256: a79607d3a5aaa4b842318f29308bb5fed86ab0bfb02f89b673b64e55fb24fb35
font_01_sfnt_off000136ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 11056 bytes
SHA-256: ff33ea36d40637d88ed492fbdf7dd76df06114371fbe4d86dc3d7e77a9eb6dca

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