Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c94c24c3b83c8e…

MALICIOUS

PDF

82.3 KB Created: 2021-03-18 13:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a1c6169274d7a0582a75ad224a7e889f SHA-1: 258a3cd35fb344e476841dd8293e494ab8663016 SHA-256: 71c94c24c3b83c8e6fed47f8a599c97dbeb37d05cbb08b2384945dc859f6d427
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, specifically flagged as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary external URL observed is 'https://gimoguvi.ru/strik?utm_term=pdf+casio+fx+cg20', which likely serves as a redirector or landing page for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=pdf+casio+fx+cg20 PDF link annotation
    • http://bimiwefumukiv.22web.org/pojogoxa.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/6438298.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/36893269875.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/lowrance_elite_4_hdi_price.pdfIn PDF document text
    • http://xuzevofut.22web.org/five_senses_worksheets_for_first_grade.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/3119373.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_is_biological_psychology.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/152bebf3.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/2255809.pdfIn PDF document text
    • http://bilapak.66ghz.com/xodepojamimape.pdfIn PDF document text
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/4161612.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/2852665.pdfIn PDF document text
    • http://wevoselaxoto.66ghz.com/kyocera_taskalfa_3551ci_fax_operation_guide.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/12e961823c8.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/pokigikodin.pdfIn PDF document text
    • https://vanixegufewip.weebly.com/uploads/1/3/4/5/134511125/2130790.pdfIn PDF document text
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/6998055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifigazanovew.epizy.com/beatles_mono_albums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f91a0b8-60c3-4a3d-8a6e-e34981e2012a/beats_solo_hd_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef660ad-dde5-4460-b16a-ca97109e7097/8208519792.pdfIn PDF document text
    • http://wivifizurata.epizy.com/67453556655.pdfIn PDF document text
    • http://dumudolaba.epizy.com/witusolozivedusovaxote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b946b52-ca12-48ff-a257-2c65e976240c/how_to_write_a_song_for_beginners_wikihow.pdfIn PDF document text
    • http://zuburojirep.epizy.com/cmo_desarrollar_la_inteligencia_emocional_en_los_nios.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_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 5404 bytes
SHA-256: 18d2169ad225c13a59d84a70b47ac5168f2d46db94b0d523a67d82fd1b2da03c
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 12252 bytes
SHA-256: fa8865f63c8277bc408a885ac8aa74125d8aea8dba5139abf566547688cb4169