Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd58e921423f9e6…

MALICIOUS

PDF

73.8 KB Created: 2021-06-05 06:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 01b5237dc6a04df53bfee30ccf509075 SHA-1: c694f32aadb3aaa280ff182ceecdfebd9008f23f SHA-256: bdd58e921423f9e6de592d64b6ad276f7eabbb7d556900b8a7597d02bd71d959
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ketchas.ru/pbw?utm_term=convert+base64+to+pdf+file+php PDF link annotation
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/dokikaperaxa-jopit.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/muxuromaguzatavexunu.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/vobilixewovat.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/vafonog.pdfIn PDF document text
    • https://biwozatilajatem.weebly.com/uploads/1/3/4/6/134636438/43c81ee.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/fivikoto_wesemunotixuv.pdfIn PDF document text
    • https://muwigoxafom.weebly.com/uploads/1/3/4/8/134869335/megan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416139/lexisnexis_police_report_customer_service.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/realtek_5.1_audio_driver_for_windows_10_free_download.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424164/42328037285.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493710/66742871166.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144487680/89536773520.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144647265/how_to_remove_battery_from_first_alert_smoke_detector_model_7010b.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144528582/how_many_cups_is_32_ounces_of_cream_cheese.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/w/file/fetch/144638730/pokemon_sun_gold_nds_rom_download.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144637626/pit_stop_racing_manager_coupon_code.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/apologia_health_and_nutrition_answer_key.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/fojevekemetenusurideko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 5476 bytes
SHA-256: b3013d5c88259c5ff35517ba94771b916ee2e91309d7721a60b2dd15867f185d
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10864 bytes
SHA-256: 1886efb236cc08cbf9b2c1ce8fb987684443c9a9754a80e343ee0777e781791a

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