Malicious PDF — malware analysis report

Static analysis result for SHA-256 3508cd66daa5da61…

MALICIOUS

PDF

84.0 KB Created: 2021-02-25 10:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8536d9bf2528332cac74bee22024cf1 SHA-1: 83182e051d8a1edd01f373f5ace81c4fc44b3bdc SHA-256: 3508cd66daa5da6136e79360d675cd4bf1ff1b91ab4ecab6e397d7316ae28816
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=cloak+of+the+raven+queen+5e PDF link annotation
    • https://cdn.sqhk.co/fofateze/idg4Yib/93059269902.pdfIn PDF document text
    • http://xaduwojitodefo.66ghz.com/engineering_mathematics_by_ka_stroud_5th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/heksjg7/anime_wallpaper_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/jgyVPw2/three_kingdoms_global_war_best_heroes.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/vector_mechanics_for_engineers_statics_dynamics_9th_edition_solution_manual.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/why_does_my_ukulele_strumming_sound_bad.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jjidXxF/soretovajulunufoladovo.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/what_is_technical_writing_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hakqjik/melvor_idle_slayer_task.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/igdhdoG/gold_solitaire_engagement_ring_with_diamond_band.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/DoibDjh/5759190355.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/mit_computer_science_reading_list.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexuzutipeku.epizy.com/dupujiriziziledenavudor.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/pirutanoratufinupop.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/sonaveriminorizo.pdfIn PDF document text
    • http://wikiwujekuloxok.rf.gd/gigamon_hc1_admin_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_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 4956 bytes
SHA-256: 88754443d2b817f9755b26aa1954577ff37afb5fda211d6b196f22fc8703b7e8
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 12260 bytes
SHA-256: 4065d4878bcf89d048fef7ec0f28b4a5458fff1a791bdf3ea4c5e97c211dcdc0