Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3627960e306123…

MALICIOUS

PDF

85.4 KB Created: 2021-03-14 11:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eded159d9eecc782c0f371d530c68c08 SHA-1: a938c1b8cf213c6227d311a2fc1c5c20cb11dbea SHA-256: 7d3627960e3061239ef484a8196278ace64bc1283ae9aac9065d4a85bfbbfc61
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics as malicious, specifically for brand-impersonation credential phishing targeting PayPal. It contains numerous external URIs, including one pointing to a link farm on disposable hosting and another leading to a redirector that ultimately points to a PDF file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/9952136.pdf.
  • 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://pelibifir.ru/wix?keyword=quartiles+worksheet+pdf PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/9952136.pdfIn PDF document text
    • http://faceit.su/microsoft_word_spell_check_dictionaryn2lxj.pdfIn PDF document text
    • http://pitushok.space/524382736226tclm.pdfIn PDF document text
    • http://openplafond.xyz/domodivebupexead5n6.pdfIn PDF document text
    • http://introdom.ru/how_much_sugar_is_in_dunkin_donuts_refreshersh5upv.pdfIn PDF document text
    • http://aviabileti.ru/behance_fonts_free3gkj7.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/eibCXje/fc_bayern_munich_basketball_sofascore.pdfIn PDF document text
    • https://cdn.sqhk.co/tatolodam/igES8cD/forejinalutirak.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/gf9lwVY/vida_saludable_aprende_en_casa_segundo_de_secundaria.pdfIn PDF document text
    • http://wopedejani.iblogger.org/how_to_start_troy_bilt_storm_2410.pdfIn PDF document text
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/tudekozofitav.pdfIn PDF document text
    • http://pixilapusir.22web.org/abnormal_uterine_bleeding_guidelines_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizavoju.rf.gd/sigugigudonalitime.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/friends_forever_images.pdfIn PDF document text
    • http://gikasabedadex.rf.gd/nail_salons_that_open_late_near_me.pdfIn PDF document text
    • http://roxoretubobo.rf.gd/reading_comprehension_book_intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/companies_triple_bottom_line_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/video_bts_dna_metrolagu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/kenmore_electric_oven_quit_working.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/54349101383.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/ketosajuvosadigija.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_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 5348 bytes
SHA-256: d4d648d831429139658e0f4c00b6324c9b7f8e8aa0dbfdb6224e0a61477dcebf
font_01_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 12628 bytes
SHA-256: c51c31d1ba9e6a3ef5529ce710677fa64534550b217bcaaf579beb17722d3b08

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