Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c86a2017cce5ee0…

MALICIOUS

PDF

87.7 KB Created: 2021-05-30 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7aff1e8a49967a95fdb50cb0dbc0a29 SHA-1: 22883f34a95cc6ba60b824ae0f60babc1c12c842 SHA-256: 8c86a2017cce5ee0d586ba10c12ce42de41cdece880a8fceed0f396effca911c
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 0.9991

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://jacksth.ru/123?utm_term=descargar+aplicaciones+para+android+en+tarjeta+sd PDF link annotation
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/1467708.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/950398.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/5753c184c76a120.pdfIn PDF document text
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/5400306.pdfIn PDF document text
    • https://lexifomaxinu.weebly.com/uploads/1/3/4/5/134595187/6948824.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/dusunokit.pdfIn PDF document text
    • https://badoguwogodunej.weebly.com/uploads/1/3/4/7/134713378/zilavapafuxevi.pdfIn PDF document text
    • https://wiwufupa.weebly.com/uploads/1/3/2/8/132814928/3813d.pdfIn PDF document text
    • https://dutaveporope.weebly.com/uploads/1/3/4/6/134600224/aaae8216.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/66a01.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/vorifezisomezip.pdfIn PDF document text
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/856cfc03cb.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/25eae2ad-9876-409f-bd5d-db0c2f967359/47603640438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a86963-dd06-42ac-8b68-9e629d2fe4f5/kepevetimilamepafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c778ada-89dd-4d73-bd4c-d617d8c67154/fiveloxufuvutazuxudatedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2f04ef-abc6-4d77-8661-cba821fa4369/yo_kai_watch_puni_puni_apk_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1844ef-5097-414d-8ada-264180f88e4d/bixefilezifufusupipufiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09a9a9a-1060-4fcc-83ab-ab1a24847e59/kenneth_hagin_healing_school_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a13eba-d5ef-4681-a44c-8ea1c3f27e55/lovarenamizoxiramopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fef3d3a-dfa5-476f-85e3-e35ace6b2ba5/is_gdp_a_good_measure_of_economic_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1fb630-e883-4406-b61a-e007fcbf29df/washington_state_prevailing_wage_fringe_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df308c7a-4384-45ac-abd6-22cf1bfd8668/samsung_rs265tdrs_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbf5766-9583-4cf4-a8c4-40199cceded4/38466524312.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_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5104 bytes
SHA-256: 501ac2fb10396b05a456334ad7eaa5c241d48961be1111d65581870a8fc1886f
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 12652 bytes
SHA-256: 5f1a20edf9686caa2ccd2ecb3030f7703dfa260ccd28c59dff459864eab023e0
font_02_sfnt_off000140ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140ED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f