Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d1eb03f0e819f3…

MALICIOUS

PDF

83.5 KB Created: 2021-02-27 08:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 96ce2ca9a500f0222bac53124a27a829 SHA-1: baeb3903c05f00eadb5d243be3b767645bd134cb SHA-256: 51d1eb03f0e819f3523d99e9f929f236b3e39fb7e25bc03050d703916fcbed4c
186 Risk Score

Malware Insights

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

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 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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=what+is+the+message+of+the+political+cartoon+above PDF link annotation
    • https://cdn.sqhk.co/tinulafi/hf5pifh/snapchat_notification_sound_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/fibsheb/carriage_house_inn_branson.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/dunuwe-xodaz-riziwikef-tulebabopo.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/ohgT1zZ/snowball_battles_for_2_players.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/felidavenirokafulenipizo.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/jipoxagew_rosuzab_tuwozuxipep.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/fojewa_gumifotadid_menaruzoniduxo.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/emJ3hiN/kexapomizifeli.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/bazozasizebog_safapiteruzewuz_vulobijisuzi_buzorulezuta.pdfIn PDF document text
    • http://pay-order.info/jelefatiwadofakazezisijivsn9px.pdfIn PDF document text
    • http://cadenalia.com/fichas_de_comprension_lectora_para_primer_grado_de_primariaqpwbm.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/what_are_the_obstacles_of_critical_thinkingq0ev8.pdfIn PDF document text
    • http://kinoxca.xyz/commercial_tenancy_agreement_template_singaporejksce.pdfIn PDF document text
    • http://naturagrush.space/80426968674z0big.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/6218731.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/b347f5a7492.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/31466495192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokuvomoboseri.rf.gd/cessna_r182_maintenance_manual.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_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 5644 bytes
SHA-256: c9f832e43a633edad223315a0c75d3c289410f5e9501778422c45f20a2da6031
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 11228 bytes
SHA-256: 3ac4d97ddd75ca79f2b822f0f0a8ecfffeb83b7dc4fd86e675a615389250a674

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