Malicious PDF — malware analysis report

Static analysis result for SHA-256 637813a8a0d020e8…

MALICIOUS

PDF

105.1 KB Created: 2021-05-07 02:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c603e3195663802032bd747e9c5824c5 SHA-1: 99f447920200a4af6640ba3f20083657e50ca0e7 SHA-256: 637813a8a0d020e8c9ec296361c11af362f3fa1ffb832efd6bb2da1ea25b286e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=fingerstyle+guitar+nail+length PDF link annotation
    • https://cdn.sqhk.co/detazido/dFggmPU/pbis_check_in_check_out_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/idH5Wjb/vinogunixoruzof.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/giheUie/pukutuzevuz.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/a_few_of_my_favorite_things_sound_of_music_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/QjeCXpK/calendar_2020_august_through_december.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/Pgejhge/paypal_business_send_invoices_and_track_sales.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff791cbea72e.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/clear_acrylic_sheet_material.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_600aa6c77dfdd.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/pomoxaxotevit.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/idPiahe/ring_a_bell_idiomatic_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5ff67aeb87865.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/lisbon_subway_map.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/jipipuwipexuxumikemo.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ctcJtii/red_sunflower_seeds_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/mgjirds/planet_of_the_humans_review_rotten_tomatoes.pdfIn PDF document text
    • http://bebobez.22web.org/proyecto_de_ley_presupuesto_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_60399ab09d355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/46544846687.pdfIn PDF document text
    • http://zemorirasipiw.epizy.com/jane_eyre_oxford_bookworms.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/kakofepavu.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_off00015e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E41 5004 bytes
SHA-256: b2cb636d944c5535287c4d608a8c3f7f931a1b07da082b069ca8aa51ff16400f
font_01_sfnt_off00016f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4B 11772 bytes
SHA-256: 1d83c03ad61e5585b684c3b2a801ec720583f0a176eb663e6b5ed125ccc84207

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