Malicious PDF — malware analysis report

Static analysis result for SHA-256 3308774a4848e2b5…

MALICIOUS

PDF

79.3 KB Created: 2021-06-06 01:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22d5137473598c66f603c941eaff45e9 SHA-1: 244813abbb82fccc1522f04079c5b8f127326e0c SHA-256: 3308774a4848e2b5548ed199b9a045c282ff1820c52977af4b8f99167a79ecf3
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 0.9994

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://huntic.ru/pbw?utm_term=partition+piano+seven+nation+army+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446162/normal_60623197780e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_6014d1ba1d9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_6032acae1715d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601b3a7f13e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600aa5a387df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff60a5fa0ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6039fde7aa634.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/524e660a8a316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_604f895c38ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_6000aced234fa.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/kubonutafa_buvefiw_nukisimapeg.pdfIn PDF document text
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/nugowajo_sulowuteditope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_60b8571149584.pdfIn PDF document text
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/zulinebovazezisalon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_60643497ec7f7.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/6a8a33c5-84fc-46fd-a9a0-e03360a86915/xawugofifolomiripenem.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144451548/subwoofer_box_design_software_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e4d778-272b-4808-be2d-9654881ee25e/85256717316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a143ca50-7315-4347-acac-607e5cfd4860/alesis_dm10_manual.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/lutafiximepijewikefusanel.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144498684/can_you_use_birth_control_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df03381-e132-42bb-99da-40b6a341e4ce/descargar_audiolibro_los_secretos_de_la_mente_millonaria_t_harv_eker.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/86185250456.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_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 5316 bytes
SHA-256: 7e84529ab82b3924b59564e94556b3cc0ce3092952672138f84c39967d6c381b
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 13088 bytes
SHA-256: 106942e9760a117cf9e09c91818859bd96c9f3f354fb98565b0883e6c66c0cd7