Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33f4ab18f3c5142…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 04:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bb37e02f9deeb7e77088f85a9ea8527d SHA-1: 5d7aa7c2ed83455061b14125dae87f5d15861440 SHA-256: c33f4ab18f3c5142173815e074e17adb83fedbe4d0438d62c73f0b55d130dd00
156 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 0.9993

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 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.
  • 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://xezojetit.ru/123?utm_term=letter+of+recommendation+for+school+template PDF link annotation
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/gawez-josen-femorig-mezotalim.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/wuxoxi-xevatokipu-nizidepatuvejat.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/xilemexodik.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/jdNwhak/87278166302.pdfIn PDF document text
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/e83bd50e402c77d.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/8755952.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/gheBidH/kosarodumisaxelozuked.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/1a7428.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/6R5tib3/wabamikedunuwaluzomibipe.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/kizaga.pdfIn PDF document text
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/5482061.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/heknicX/woodworking_lumber_supply_near_me.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/121854b8432a.pdfIn PDF document text
    • https://jometuke.weebly.com/uploads/1/3/0/8/130874139/kagiworugovati_vijufe.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/zazelujeju/17770155124.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/sumif_between_dates_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_much_do_journeyman_welders_make_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/derumeto.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/51340479703.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/blended_full_movie_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/92407132169.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/what_did_the_third_estate_demand.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/phet_simulation_static_electricity_worksheet_answer_key.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5336 bytes
SHA-256: 852fdc0adcec13267d704274b6ab8b2c7190ba83194ce6d11169cf0fa9ff8600
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10556 bytes
SHA-256: 0e26c835c71590b85129b634817f9b132cd2dea70423e26b36e5b4a3403e46be

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