Malicious PDF — malware analysis report

Static analysis result for SHA-256 416030b9e0eabfdd…

MALICIOUS

PDF

76.3 KB Created: 2021-05-11 07:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 532f6d99cb2372ecacd5a0626bfe3b9e SHA-1: c1d103d0a96147eea422fdce95e408609848240c SHA-256: 416030b9e0eabfdd8bdf904a6d46d660ea018ed1205dc8497c85ab0033739ac3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=dungeons+and+dragons+creature+creator PDF link annotation
    • https://cdn.sqhk.co/lofakekaf/giLjagg/dezofomuvupe.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/Cjfihjb/nopariguvetasivefamufedo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ojelia9/okcupid_a_list_price.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/jcPsgd5/97746651807.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/ijB0tgc/wormate._io_hacks_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/XHLghnD/19189784657.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/uhjfjbV/digidesign_003_rack_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_60651c55387b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_603585cb6dd4a.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/kuzoxejuxofaz.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/m0idcSK/iron_heart_black_denim_shirt.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/xogudupawovi.pdfIn PDF document text
    • https://fadafiwu.weebly.com/uploads/1/3/5/3/135302778/9723258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fe275ba1895f.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/pibajuwi/the_warren_buffett_way_summary.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_e21999e20cbd440eaa96fce0a618eab7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/retail_cashier_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/fomezilumuw.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_29d8bb50ac214645b455089bfe4eb005.pdf?index=trueIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_c108f686251946d5a93cc458d0a1a12e.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_c51698be349d47a19fa2adf6ffd5e999.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/borgholm_modern_upholstered_storage_platform_bed.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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 5076 bytes
SHA-256: d4807bce9194b4aeb1bba16a41c810e8572b9c50e01b01dc13c5dc1a8d764f6b
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10604 bytes
SHA-256: 56774903edf07a12893d3a95e1b4f91ff02e5d5f45f7a3f74ec2d9e4c7984b1d