Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f239b3cec766c6…

MALICIOUS

PDF

79.1 KB Created: 2021-03-06 20:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af586ae97ee785a143aca4d22531ab92 SHA-1: 36703f2da1fdb0fa22d89aca493c2d64477edd70 SHA-256: 15f239b3cec766c68b814e0e0a35077fbd90ca1512b9b5acf9b59fc4823b7a7e
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The embedded URLs likely lead to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=thingamajig+candy+bar+where+to+buy
    • http://bewagubidebesun.iblogger.org/b._ed_date_sheet_aiou_2019.pdf
    • https://cdn.sqhk.co/goronikel/hghXjhH/89947225325.pdf
    • https://cdn-cms.f-static.net/uploads/4468537/normal_603f402c07495.pdf
    • https://cdn.sqhk.co/tobamozusaj/fhMhcgj/marketing_communications_manager_salary_chicago.pdf
    • https://cdn.sqhk.co/bezofusipow/Sjjsbhf/stick_order_empire_hacked.pdf
    • https://cdn-cms.f-static.net/uploads/4373779/normal_601a46c9d9670.pdf
    • http://natojawu.22web.org/78988692563.pdf
    • https://cdn.sqhk.co/fifenije/eUbhcJu/monster_shooter_game_download_jio_phone.pdf
    • http://zonuvak.medianewsonline.com/translation_geometry_worksheet_doc.pdf
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fdb8e0d25277.pdf
    • https://cdn.sqhk.co/duwutawuna/gfjfGOA/98237274486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_9d4474059e794cb0ae8415be1d58704f.pdf?index=true
    • http://nonogopikizezed.rf.gd/pasipekijejedagisapi.pdf
    • http://gijaguvid.rf.gd/metowixirifalibaxo.pdf
    • http://vigexosav.myartsonline.com/how_to_wear_beats_pro_wireless.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_92e7ac7a9d5f4a3fbe0e7c244bb99075.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_7513b4ded0ab433a937c0858344afd5c.pdf?index=true
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_731c24e9033843fe9c13699cde483261.pdf?index=true
    • http://rabatelekovufar.myartsonline.com/50800598779.pdf
    • http://pimokizogo.epizy.com/viki_korean_drama_apk.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8ec5ea4072904ac2be061746b7e78ade.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_ca578fceb82f4b87932c0a1497d5ac65.pdf?index=true
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_6024e8d043f74e5ba353d09e844e4735.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_e4d66f88750846058265de0931c4d530.pdf?index=true
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_49c04a7b294344beb31182200e12dd9c.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_70d0f1aadefe4839a0f761b4793249d5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f653.bin
1a8b0796c1350cc92d6bf56ec95b310f1196701bf9a70ba9af906e86d9097339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 5500 bytes
font_01_sfnt_off000108f4.bin
889ac6dc593729e745d172476792e9b514bf21dfd09b5e925417271089d5d5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 10996 bytes

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