Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03dc8f4f19a15c1…

MALICIOUS

PDF

80.3 KB Created: 2021-04-25 03:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdb770c180b4ec0943e2660052b0906e SHA-1: 188c8c40a52731e71b3e87314ffa9224b0c2460d SHA-256: b03dc8f4f19a15c16e0d59294e0499ff1ecfe7081ec360d0c81bfc75deedbef1
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9995

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=abstract+factory+design+pattern+in+java+journaldev PDF link annotation
    • https://cdn.sqhk.co/gawagunikuw/jcjjzgj/galaxy_shooter_rad_space_shooting_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/RzfigH3/jurassic_survival_island_dinosaurs_craft_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/Tgcx46K/54145268377.pdfIn PDF document text
    • http://perevod24-card2card.site/29616572290zkhzn.pdfIn PDF document text
    • http://xajoraxi.22web.org/circle_geometry_worksheet.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/econometrics_lecture_notes.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/lagu_abiem_ngesti_album_dahsyat8x69n.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/tjg7zNB/ropuzepebivufon.pdfIn PDF document text
    • http://wordwild-store.com/bejuvenuvivoguruliruxijx85m.pdfIn PDF document text
    • http://intereriia.com/designs_for_ppt_presentation_free79aqf.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/zubuwujoxom/32591226140.pdfIn PDF document text
    • http://jamujufumazuwir.rf.gd/memupi.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/sefadot.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_155012674f3941998c025308a7097fb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/43386852688.pdfIn PDF document text
    • http://gofudawaropuz.epizy.com/vurufad.pdfIn PDF document text
    • http://gifesikubelazu.epizy.com/zitefozuvar.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_bf54dee4321e4d3b8869ce2cf1b58e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/dedoxabuxironetitu.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/pexibudopefoveg.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/how_many_movies_are_in_the_insurgent_series.pdfIn PDF document text
    • http://runatabipodoxup.rf.gd/el_agnosticismo.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 5688 bytes
SHA-256: 39a8953bbfc99443967a6b3733d653cc5a212f6e1013d7727f4167c9a802533d
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 12544 bytes
SHA-256: 61f414701366a80c214d12d2cdc69e924ad4c17dd474a62eb9b781b928c6e804

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