Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cb5ffc40063643…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 11:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 598c313b0f0f0a91f857481f90c9c8b1 SHA-1: c490359d272eee8129c42e1e2da24e48864ab655 SHA-256: c9cb5ffc400636436d6f270ee4feddffdf39b7a3eda3f2e15233ae074693fe8d
226 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 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/strik?utm_term=warren+buffett+letters+amazon PDF link annotation
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/6770214.pdfIn PDF document text
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/5719ecab246e.pdfIn PDF document text
    • https://povominuvuz.weebly.com/uploads/1/3/5/9/135961678/xoxuzarojakuje.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/b61690cff.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/zovifozus.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/ramebulikelotul_tasatafodekuse_solobajumimu.pdfIn PDF document text
    • http://bijavamu.iblogger.org/laravel_blade_template_if_else.pdfIn PDF document text
    • http://xobuxok.22web.org/traducir_archivo_en_ingles_a_espaol.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/7975808.pdfIn PDF document text
    • https://xobagosuwetir.weebly.com/uploads/1/3/2/6/132680986/a952635a9a3aa6a.pdfIn PDF document text
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/vokejagonunub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a56c88-2f11-497e-877a-cc24f4ff0be5/hp_5510_printer_wont_print_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62779850-62c7-4de1-880a-de4290ce5887/xitozamoxosub.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_8f7d2e6e90c0494daa34b45f659a4ad5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/086618be-9657-41d8-adef-11d9deb71d52/the_story_of_your_life.pdfIn PDF document text
    • http://vetavewolo.epizy.com/rixukanaxivute.pdfIn PDF document text
    • http://rodaselawowov.rf.gd/89739635094.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_4ae60e4e00ab43779e03d2a34ac754a7.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_7328090a6a584fb0926d521183875389.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_b9d4c0a884cf4d208d270654b1093081.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_8837d014c3cb4de4809ede5f7a84b50d.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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 5116 bytes
SHA-256: 2ad4b54acf5aedb7aae9f08320e33e3afc16f813de790746a2690622d12e2d41
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11904 bytes
SHA-256: c048a39798f10f4724a8cc41fc2a2a780180f752f825537b6c67836cc76f95fc