Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c699422c079b2d…

MALICIOUS

PDF

66.5 KB Created: 2021-03-11 00:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a47fb22cbc18f7278ab209b805d1fe90 SHA-1: 53eefd18c149b54507e63f1d2cc88e1ec3a38a61 SHA-256: b4c699422c079b2df248712d41654b5d37740e3557ff47ee2067ada80b4d3c3a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://fokemale.ru/123?utm_term=angel+answers+oracle+cards+free+online+reading PDF link annotation
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/nofap.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ghPEha4/air_jordan_1_mid_chicago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61dabd37bd.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/Fkjcgf1/3d_music_player_equalizer.pdfIn PDF document text
    • https://cdn.sqhk.co/mujetujojen/bibeQih/boresukimozaxus.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/roluk_ruvebexudopu.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/91383119624.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/spanish_grammar_book.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/dijupurugugo.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/westinghouse_3_plug_timer_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_60109ec4add2c.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/loneliness_and_depression.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/rubizuxapesesa_gijapu_juzisov_vujoxegaj.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/wewizegoxasodaxev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6029f46c41d63.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/zinudipir/wahl_pet_clippers_target.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/ginamalemodotowugulewa.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/aircare_humidifier_82600_parts.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/cholesterol_lowering_diet_plan.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/a_clash_of_kings_chapter_47.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/best_tara_brach_quotes.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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 5268 bytes
SHA-256: f87c8053d7435c6d559ec7f32ef5176b57728cdf84def7447e5c1ea0aca46303
font_01_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 9236 bytes
SHA-256: 66af08bce072ee86cdad20d13437180e89020362df43439b47b94b5782af5668

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