Malicious PDF — malware analysis report

Static analysis result for SHA-256 63035055e42fe50c…

MALICIOUS

PDF

80.4 KB Created: 2021-02-22 12:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4ab8f5a2c307dc3cad2b29d4e219db3c SHA-1: d6b2f1003fad337a2c8cab04667244a380565b8a SHA-256: 63035055e42fe50c79f3db69ea28af634d86261738125b78ef4faf9dab3aa1e4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one notable URL pointing to a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/123?utm_term=sloan+flushmate+always+running PDF link annotation
    • http://1cats.space/manual_calefont_splendid_ionizado_7_litros5uml2.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/8695979.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/1cd0089fd.pdfIn PDF document text
    • http://checkmycredit.info/us_military_ranks_and_rateswf55w.pdfIn PDF document text
    • http://timecodes.net/netherlands_schengen_visa_application_form_guidece80l.pdfIn PDF document text
    • http://musofiron.ru/tom_clancy_jack_ryan_moviesjrs3q.pdfIn PDF document text
    • http://runolive.com/sijoje90d1u.pdfIn PDF document text
    • http://beststudent.space/50012956776qtie9.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/9621708.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/jesil-fizezalaxataf-suxaxe.pdfIn PDF document text
    • http://tularobumof.66ghz.com/preparation_of_ascorbic_acid_injection.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/saromosojotaxew.pdfIn PDF document text
    • http://pedron.fun/dezixakidobuzozuluza9eh6q.pdfIn PDF document text
    • http://zogagutezuwe.22web.org/68853952081.pdfIn PDF document text
    • http://austritkfa.com/76117542568ljdlk.pdfIn PDF document text
    • http://faceit.su/5431383091ox1o0.pdfIn PDF document text
    • http://usesucre.pro/why_is_my_toshiba_tv_so_dark03t5n.pdfIn PDF document text
    • https://zedunuburow.weebly.com/uploads/1/3/4/0/134042823/rabuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kudogal.rf.gd/kemeki.pdfIn PDF document text
    • http://gazinopalevigem.rf.gd/76658028710.pdfIn PDF document text
    • http://banebogol.epizy.com/cedar_city_weather_report.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/54139243753.pdfIn PDF document text
    • http://ledojefuvase.rf.gd/78724093842.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/73234586717.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5360 bytes
SHA-256: e62a1a22a238cb9b618ff2dead7ffc8455e166de74a9940b3d1565f18eec37b4
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10960 bytes
SHA-256: 3119fdb3854012c0ba046253da5ad165de7e983cbbe2e4c5ff4a9d62e5e5383b
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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