Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b266a89fd51c0e9…

MALICIOUS

PDF

83.3 KB Created: 2021-06-09 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0795bf6bfb95ed2123423cc91ce904b SHA-1: 173c2658a50acc7c9b296b685e107a636aed94fd SHA-256: 8b266a89fd51c0e99c3e24401596495e8e5e73c542b84a382fb7a475db10be00
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 0.9996

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://crysiq.ru/pbw?utm_term=sadlier+vocabulary+workshop+level+c+unit+11+completing+the+sentence PDF link annotation
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/8510744.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/9382177.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/be68f0.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/4c63d30bb1d.pdfIn PDF document text
    • https://babejogoj.weebly.com/uploads/1/3/1/8/131856270/pisizudupifojiti.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/4ed18c9062.pdfIn PDF document text
    • https://mubaxuru.weebly.com/uploads/1/3/4/6/134693734/6473619.pdfIn PDF document text
    • https://kizuzeno.weebly.com/uploads/1/3/5/3/135326612/mowidojavo.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://uploads.strikinglycdn.com/files/8a39e508-e629-4833-8b60-bb013f4fc4f9/ge_monogram_appliance_repair_near_me.pdfIn PDF document text
    • http://lufokomarib.pbworks.com/w/file/fetch/144476385/29266745644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07afa1d5-9bba-46ef-8a1a-214c7e532d08/lagofree_moda_italy.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/mabidulavokusolaxuwovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec22430-aedd-4911-abd2-d1b01c526128/chicco_fit2_vs_keyfit_30.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144875760/xukatewafofufujaxofe.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144470067/fiwodewapodazato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28aff7cb-1851-40f0-b174-d13b7ccc8359/which_liquid_detergent_is_best_for_front_load_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014e328c-aa56-43c9-9c7f-6223fe5ebadc/how_do_i_reset_my_gate_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c31d898-7836-4f6b-bfee-96ab4524fda5/nokarepevefazemupekudixas.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/67960761851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2eeccb-7bb3-444b-b145-82bd1afffb15/how_to_remove_adt_safewatch_pro_3000_from_wall.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/nafudanomoda.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_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 5980 bytes
SHA-256: cb9f2a0c87ae24b3d99889447ca228bdefebcf565a34d689a996051c95e248eb
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 9568 bytes
SHA-256: c59c2fefa71849a044e373bb07b07a000f94bc6fd62b7ccac993ee17a85f30df
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f