Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0c6b01b7984b5a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 05:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: be3638d43b407420e0f424394567b0b0 SHA-1: a14bd95bdc911e6263980489f7f42d9863940008 SHA-256: 6d0c6b01b7984b5abcebc9207c01a2aef0a748db009eca3bdf524f98b3c6a39a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'welding inspector' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful websites.

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
  • 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://xajibur.ru/strik?utm_term=how+to+become+a+senior+certified+welding+inspector PDF link annotation
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/5983558.pdfIn PDF document text
    • http://optamorem.com/how_much_does_a_cessna_172_cost_in_indiahte06.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/9b6f4edb61b47.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/4fba7a02837b8.pdfIn PDF document text
    • http://sunny-web.ru/suvotebafanudojulujixitir1jwwy.pdfIn PDF document text
    • http://jobauthor.online/joremivatifulosenunapilm4mba.pdfIn PDF document text
    • http://pitushok.space/pdf_to_word_converter_for_freevr9y5.pdfIn PDF document text
    • http://liketime.fun/ac_dc_thunderstruck_pianodhf9u.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/sermon_for_mothering_sunday_2019.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/wedakafonumabin.pdfIn PDF document text
    • https://kipakewetug.weebly.com/uploads/1/3/4/6/134606983/f5d260e2195d71.pdfIn PDF document text
    • http://instacopyrightcenter.com/how_do_i_recover_my_facebook_email_addresslehzq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/safuvefagikawenibopaw.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_9be57a02afed49fea75fc933a0a9ddcc.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_b8603c231d124741ba57794273817be6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/muzaxovojo.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/25258589869.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/how_to_pick_up_walmart_grocery_order.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/would_you_rather_questions_drinking_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/blowpipe_vorkath_guide.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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 5668 bytes
SHA-256: 1da5d41a986ee94a2951f298fa7af3f7f3eed5206a4182cc2faf84016d3fefe2
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 10796 bytes
SHA-256: e60340f7cdbddac2fe70a50cea0ed518ff2f409d9f6f6f7a0a8550f661477304

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