Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdd9b04c99a1ff8…

MALICIOUS

PDF

71.8 KB Created: 2021-04-01 19:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0dde5333de67bee4ab59d47ad7570033 SHA-1: 72cbcaa9a662da933b894aee1719a7a2d1bf5ae8 SHA-256: 4bdd9b04c99a1ff85f96025d565ecde37552231aa1f3ed9ce8f7dcea8d325895
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the heuristic firings point towards a tactic of using a seemingly innocuous document to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=castrol+atf+dex+ii+pdf PDF link annotation
    • https://cdn.sqhk.co/sezunofubuzi/Z5ih9Ot/41091242359.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/qggifeV/ivory_soap_and_juicy_fruit_gum_song.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hlOmBwr/92901856498.pdfIn PDF document text
    • http://italywom.space/lelinaxonubenavq6lq1.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/bodyweight_exercises_for_biceps_and_chest.pdfIn PDF document text
    • http://faceit.su/how_to_attain_food_securitydsrl7.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/xapazudixun.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/igDBhfd/miboretakakodokaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/hbwiGQ3/54127539150.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/gTjihC7/tipping_point_greenland_ice_sheet.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
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_f470216ed0b846b28a80faaddf3fdb44.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_4088cbe20f2141aba9b4374105ab5a20.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_d1aa9069c0d6425d90a09eccdd229199.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_885409253a974730ba07ba3f4ddcea34.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_0e504471a7be4efd8e4cccf9b8e2fb0a.pdf?index=trueIn 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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 4808 bytes
SHA-256: b12beffc1f0a5da15a176f5808a02e4f09ba6b2a1eef68126a66a9802771ff7f
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 11340 bytes
SHA-256: 25b1acd7cadf26bb6d3a5c480b225ed2b0ad338695161f172ea0f861de86b577
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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