Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d37af457647104…

MALICIOUS

PDF

82.0 KB Created: 2021-04-19 07:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e186b12ea964c73940229c1c37ee49a2 SHA-1: 9bfe2ce4e87f3231070938b77e2f762c535d0aa2 SHA-256: 52d37af457647104b81897c060703af3b3abcf6fb60850650ef705c337e6f534
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 0.9998

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://botokaw.ru/strik?utm_term=multimetro+agilent+34401a+manual PDF link annotation
    • http://lumacy.site/32432422144ksuyl.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/X8Yiaid/filowawewozitorogar.pdfIn PDF document text
    • http://g2am2e.xyz/71165431447p0vof.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/xaporiforep.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/1311018628.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/manufactura_global_y_gestin_de_la_cadena_de_suministro.pdfIn PDF document text
    • https://cdn.sqhk.co/wemavutulow/gNqiaPz/pepeninizarevegow.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/biblioteca_de_alejandria_libros.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/iiaiajg/converse_bota_plataforma_imitacion.pdfIn PDF document text
    • http://it50off.pro/femozos4mz7z.pdfIn PDF document text
    • http://repair-monokoles.ru/history_a_very_short_introduction_summary4eqpt.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/hcIyIhe/spartan_firefight_mod.pdfIn PDF document text
    • http://50offstore.pro/3247838190659uzs.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/zarevizebi/38135587093.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/vuluxobilanu.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/xemebe.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/36005211715.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/nigugefabuwesuliwufasizuf.pdfIn PDF document text
    • http://tunowik.epizy.com/android_toolbar_show_hamburger_icon.pdfIn PDF document text
    • http://marivugedada.epizy.com/40959797534.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 5276 bytes
SHA-256: 8087b49f9cb7684e27d63755e758e461e4a92995c1efda28cd28c4cc923babc3
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 11832 bytes
SHA-256: 8e566440f155cbaa6d690923735484d54675c37e21144385b94faced3675f1ab

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