Malicious PDF — malware analysis report

Static analysis result for SHA-256 da90c6d5022b4c72…

MALICIOUS

PDF

76.9 KB Created: 2021-05-02 02:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f0fd7e175c9f205d2091e82ab0f8f63e SHA-1: f6dde7bb59804ea813ffbd7adb35ab2b59cdd77d SHA-256: da90c6d5022b4c720e9eb6eb6ab517d0bcc70bc3bb768c4e7e1965f2d0b91044
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=the+killing+joke+hardcover PDF link annotation
    • http://grantmedica.ru/43768472606bl0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_6051730654ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6013bdbd7c220.pdfIn PDF document text
    • http://blablablacar.online/96074579167wqejq.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/3ds_max_2020_manual_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_6031f1f73577f.pdfIn PDF document text
    • http://life50it.pro/gusoxarimigoxuzolejizaerrsf.pdfIn PDF document text
    • http://brumbum6.xyz/achieve3000_answers_the_marvelous_st34wfb.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/why_is_samsung_washer_not_spinning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_60158f5802506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5ff27d44523fd.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/rewovalegurorasu.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/lumevaxinatazera.pdfIn PDF document text
    • http://asia.kiwi/jarojolodojimumelumufaw1qxfn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/biramoxisuzizidurefiwaxi.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/cambridge_latin_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cd936c-0115-4f2f-9ed2-b602857e62c7/ultegra_di2_groupset_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/crazy_frog_dance_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c83e200-8a42-4072-a991-786f84245838/is_nvivo_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9252c06-7c21-451d-a469-ad4b0a2081b3/48806876288.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/what_did_the_grants_discover_about_galapagos_finches.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/focusrite_scarlett_2i2_2nd_gen_usb_audio_interface_review.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5172 bytes
SHA-256: f6558d0ffb1b52fdb8222713537478f2ee62958e2d28e57d9c23ee2780b3c645
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 11672 bytes
SHA-256: a90aebbf3cf1f9301b464dffd665c86cf730cd1d8c90e7826272b95fa430708d

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