Malicious PDF — malware analysis report

Static analysis result for SHA-256 812436263fcdaa6a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 12:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b49815a0a5f6860bd7b4501621ef20db SHA-1: 90353cdf95eb1e1fe0c8299e5041d7730036bb2a SHA-256: 812436263fcdaa6acf43b6c133511911555d7615c2fcbdee9cb543b044286e10
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 0.9998

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://vilenefex.ru/wix?keyword=advanced+english+grammar+test+pdf PDF link annotation
    • http://presentinsta.online/whatsapp_status_images_in_punjabi48epe.pdfIn PDF document text
    • http://7lessons.site/833322603995q7ia.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/rabupipi.pdfIn PDF document text
    • https://muzamurariwuf.weebly.com/uploads/1/3/1/6/131636995/kulabepojixu_gosezofeku_lijeg_jitolog.pdfIn PDF document text
    • http://20970907.net/51576298687r2z0u.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/gawaresireziluvoz.pdfIn PDF document text
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/648adcb94b580b.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/701e5c141fad.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/zifoxaturejuvagawodo.pdfIn PDF document text
    • https://sasugitakog.weebly.com/uploads/1/3/4/6/134651708/vozijovonimifigo.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/jetate-sonovotudokuw-zugudoketo.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/bidetafidoxiwopavejosioee82.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/57b521681a.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/16375.pdfIn PDF document text
    • http://vorgazme.com/2868993988099y8e.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://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_96e3a101449f498090b594f868c972f5.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_64ee9d71e28f4ecbb95802fc1499b88c.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_a85471c864ef41a4b34312d2f05fcaf6.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_be61960c9a354bdd967d08f395e1bcad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 5296 bytes
SHA-256: 8edd07ca02b2de7ce08db538a5b69534cfebabf9d3465aaf15f037d691bb421e
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 10944 bytes
SHA-256: 92bec2b95c7beb88a9bc54426424b0806e139f89598ae30dcf4186c85fc02e64
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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