Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb979ff5065af4a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 07:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 481436b1d18da4d6d2e4b5b3c5357845 SHA-1: 1f1192d12bb7afb686bceb62d4303bbd2c5b34f7 SHA-256: dbb979ff5065af4a075d6d760646e15b4c7089c0dae092b28c3b63ae7765835c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which appear to be disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://baarspo.ru/123?utm_term=html+css+course+details PDF link annotation
    • https://cdn.sqhk.co/rufopunuk/fijiguy/razowizupe.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/MWijdge/masterton_park_bowling_club.pdfIn PDF document text
    • http://50offshop.info/sikalastic_710448ch.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/O3giXhj/pacsun_near_me_hiring.pdfIn PDF document text
    • http://center-san.ru/obituary_format_in_zulu3og8j.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/be74528a6cca9b9.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/jjUjcjg/t_mobile_emergency_calls_only.pdfIn PDF document text
    • http://visiwetivopewe.iblogger.org/consonant_clusters.pdfIn PDF document text
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/7502251.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/jcse83u/castle_wars_online.pdfIn PDF document text
    • http://moymagazin.xyz/undertale_battle_simulator_play_onlineh06w5.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/3583664.pdfIn PDF document text
    • http://copyright-supporthelp.com/vejiga_hiperactiva_fisiopatologiage2ve.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/cjeighe/23835145579.pdfIn PDF document text
    • http://keepxufi.space/76276990345roj0.pdfIn PDF document text
    • http://scarcebook.com/526438760195tkqk.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/5372838.pdfIn PDF document text
    • https://lemapola.weebly.com/uploads/1/3/1/4/131407815/6882534.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/sjg06ib/kode_pa_apps_android.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/395158028585fdn6.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/VrO8idi/gipovamiravaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 5044 bytes
SHA-256: 599a9d81a734d5c6421be3e9ce769e8da042203c61e6ba41c02d98bb9229fe73
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10764 bytes
SHA-256: ae991b6659d61823f4ade92e7a1b3f615395063be610348d27a2d03ad91d4a39

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