Malicious PDF — malware analysis report

Static analysis result for SHA-256 04143bf5cc902ab6…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 14:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63ac59211eb3c752e9b0103f96a9cfcd SHA-1: 1b3c5a46243a3e7607ef212b8a984cea753ccb17 SHA-256: 04143bf5cc902ab663246dc134487aea2a20db597d95e97973fb2bf21ed34c04
126 Risk Score

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 0.9999

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://vilenefex.ru/strik?utm_term=honeywell+xenon+1900gsr+barcode+scanner PDF link annotation
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/visugifiv_ferefetesojab_wefedofiv_duranugikos.pdfIn PDF document text
    • http://blaugrana.ru/libro_de_metodologia_de_la_investigacion_2019_sampieri_2da_edicion02btv.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/liliriwiwuj.pdfIn PDF document text
    • http://ravevuzovije.mywebcommunity.org/how_many_pages_are_in_the_book_midnight_sun.pdfIn PDF document text
    • http://menazubuta.iblogger.org/aamir_khan_transformation_in_dangal.pdfIn PDF document text
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/teporoziwujukur.pdfIn PDF document text
    • http://mugedly.xyz/katekikamuseliw270c.pdfIn PDF document text
    • http://lessonsonline.site/how_to_start_echo_gt-225nolcz.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/technique_pour_arreter_le_bgaiement.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/vupetufelaragapipu.pdfIn PDF document text
    • http://gazawadowig.22web.org/glencoe_algebra_2_online_textbook.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/5575551.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/physiology_book_by_ak_jain_download.pdfIn PDF document text
    • http://sibidadaduzej.iblogger.org/alphabet_arabe_pour_les_petit.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/xadikupokijesoriraxuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munakazoxan.epizy.com/paxinarevanepu.pdfIn PDF document text
    • http://gogibesu.rf.gd/apgar_score_adalah.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/mepive.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5820 bytes
SHA-256: 018f2461c1ee412e810eee7062835c3f2dcb45a680899aeb1fbd0c3823890e2f
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 22212 bytes
SHA-256: 4da6518d99882127c84ac57f22e175571d2e6deac34f72738b84f218c02c535d