Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9987d38742c849b…

MALICIOUS

PDF

135.2 KB Created: 2021-06-09 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 70691e9026fa65434d8e1e9ff5f2e2c7 SHA-1: 4c34dfaf7a346b8244ae5474b0b341c8656565bb SHA-256: e9987d38742c849bec584e7de9c6ce8e8194a2811f53beb5bf84119364cacaca
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm strategy, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/pbw?utm_term=mahabharatam+telugu+full+story+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcbdd099117b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_60247b22938c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd3b1361da80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6057ccd9252b3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450139/normal_60b421640de5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fcbdb6a4f199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_604e8a157c911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_60663bcd57ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_600a19eded352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60bb81ea6bc24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_604bb0273dfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_605b01cc52dc3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460461/normal_60afebdd3bf58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7f2369-b024-4914-8f06-2a4921ae0c02/gujepexugiruf.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/f/pokemon_platinum_nuzlocke_rom_android.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144557478/bisuxixe.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/tiwofokenotatabivasamusen.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/what_channels_are_available_on_dstv_compact_package.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144865098/jebiguraxekunedojubukiz.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/f/fundamentals_of_electric_circuits_5th_practice_problem_solutions.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144516123/30619711652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae2b3b7-044f-4a68-9f40-f6f81af7091b/rowoluretapili.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA9D 3256 bytes
SHA-256: 1b6126d8a4b9d401fa2963c0df82c13dc04d9b3d97bf9bc6df960f610becf679
font_01_sfnt_off0001c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C63C 5704 bytes
SHA-256: 896248378075040183ab7f94a6b06998cc451d31a43d20e439b4c10d1e8036d4
font_02_sfnt_off0001d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D988 13264 bytes
SHA-256: 60de5308a388ac9d232b639690dcd62a01d31f73019713f8d2bb523118de3e50
font_03_sfnt_off00020330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20330 2300 bytes
SHA-256: d16d8ebf5a205cc1f3f52f24573ff2c69ccb6e69389277a7ec073d1d353b5f51