Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb87ccd5db3d4b65…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 15:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46006f59a502f06e08d2cdc3afa93d49 SHA-1: 112a0670d860f9ab33cd229542b3058a8b02b4c0 SHA-256: fb87ccd5db3d4b655a563a53133369bfa42e16b13d366e561c23e38da9f66623
186 Risk Score

Malware Insights

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

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 0.9990

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://kuzutuzo.ru/award?keyword=gastric+sleeve+pre+op+diet+pdf PDF link annotation
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/f18ba0eb03e73.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/gAGgeoY/knife_hits_3d_print.pdfIn PDF document text
    • https://cdn.sqhk.co/pokivozu/dnkigja/the_floor_is_lava_video_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/FidFUja/somosiviromofesojin.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/ha5iehb/game_dev_tycoon_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/jpghhgA/totimodezoteki.pdfIn PDF document text
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/nosutipogodivodu.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/mavuxone.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/gomakobez/what_are_the_4_main_types_of_paragraphs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30acb3aa-9c62-44c5-a488-83df5e70ecd2/38187616334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b2b1ca-e87c-437a-ba4d-51b852d73427/wedanozi.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_e5cf2a9ed17e4a01aca7eec786dc8fd5.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_12324873a8f44f7ca7d4841c0bd00190.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_68b05130cde74f5086fbaae9a52b4945.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_e9c1e8613ab74246af12cfed20ee4006.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e35cbf5cb8424b3aa8b41d2bc4121e98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/spectra_oven_heating_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c793a528-ba2c-401d-b675-053108324dcd/toro_lawn_mower_repair_shop_near_me.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_4be4df33382b4472a872f4001465e27e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/vilozuseget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8bb109-66e9-47c4-a9a8-5763e1cea2c4/rutebuza.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_2e177bb532404b4d83b3a8b2e81e4575.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/16151216427.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5dd764e488a949348140d65ff83d1a3b.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_170c16fc2dd84209adcd250d36a89919.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 5240 bytes
SHA-256: 678b86a306c4bb882f0f165bf49abce393f635a9275759c6be415f1fd0aa828f
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 10764 bytes
SHA-256: 21f42cafe8a75f7b6b8fbe9e3a9988e0febf5aa177a4aec22ff2adfc3ce9f476