Malicious PDF — malware analysis report

Static analysis result for SHA-256 d683c66a168634ff…

MALICIOUS

PDF

62.3 KB Created: 2021-06-08 02:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 207cb928c4a7c47ea3f5fbaf31f9ed67 SHA-1: 36ff98a7c139fd356b9d26086ecaa260fa8a56bd SHA-256: d683c66a168634ff5c0d5251e40a988112cfebbe331bf303705dfb8ed4a1182a
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The presence of ClamAV detection and ML flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest potential for malicious JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9382

Heuristics 5

  • 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.
  • 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
  • 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://infrive.ru/pbw?utm_term=9.s%25C4%25B1n%25C4%25B1f+resimde+%25C3%25A7izgi+%25C3%25A7al%25C4%25B1%25C5%259Fmalar%25C4%25B1 PDF link annotation
    • https://rosolovok.weebly.com/uploads/1/3/4/6/134687291/1208179.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490380/normal_60aff33fc7756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_6069c1da01a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5fcf2f5d3fe2f.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/sezakupazi_jojudas_ranowojenoda_maberubovo.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/mapumonidaga.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/8700274.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/1882401.pdfIn PDF document text
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/9861922.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/wakudet_timoguduj_roniwalexugeze.pdfIn PDF document text
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/zovonebekexosabuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_603c07ccee47c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumasenekera.pbworks.com/f/will_fifty_shades_of_grey_ever_be_on_netflix_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca19df6-77e4-4bfc-8592-0e0f37998a49/30305950386.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/robux_fee_calculator.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/goxafemovolajif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f31a3d7-ca9b-46cf-8c1c-9e2308e05599/xotic_ep_booster_dip_switches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a29a891-973e-4ab0-bc03-3bf91775272c/what_are_values_in_civic_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd51355-e3dd-4831-bdaa-d445465ea529/sunetujunelurew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfac7be-8c83-4a85-9cb8-2ed7632d9dbe/garmin_forerunner_405_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a296339-c03e-47b1-8fee-b1a65386d202/que_es_un_editor_de_presentaciones_power_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cba1182-e51b-49fb-b5b1-588ceb492251/maximus_body_free_download.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 5832 bytes
SHA-256: 392cc7cc570eb654d1e2f57f6fe09ffc0caba972a1d359dc95f9fc3d2bb33401

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