Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd0978d0094fbd0…

MALICIOUS

PDF

71.5 KB Created: 2021-03-30 17:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4144146cd0b28cbdbc58bfeec19de065 SHA-1: 22baf385cfe12034f9460123c34640a6041a1ff2 SHA-256: 3bd0978d0094fbd0f3d5fa5bb3478823e121623effcce2db0bd145dd84f0bf2c
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 0.9996

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://baarspo.ru/award?keyword=tabela+de+anions+e+cations+completa+pdf PDF link annotation
    • https://fupotepalakeb.weebly.com/uploads/1/3/5/3/135351483/dopelajenolisagene.pdfIn PDF document text
    • http://mutuseki.22web.org/bulldozer_parts_and_functions.pdfIn PDF document text
    • http://lozajakar.iblogger.org/nativisibebusopikiv.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/87a6a6ca34.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/wugubanukogawaveko.pdfIn PDF document text
    • https://mibarepazakeme.weebly.com/uploads/1/3/4/6/134685426/3379576.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/kakelaroguniz-kataxobajana-nowopakugulole.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/jetebasit.pdfIn PDF document text
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/fb9724ca1f52603.pdfIn PDF document text
    • http://kozijadeji.22web.org/technical_writing.pdfIn PDF document text
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/sobulugijita.pdfIn PDF document text
    • https://lolisusije.weebly.com/uploads/1/3/4/6/134627287/8508346.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/nisirafen.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/d5501eaf0e.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/169f7054-c032-4f66-a773-422de83660f0/gofupe.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_1001081c25934db8a083f9cba8f55715.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9475b1e-4a59-45b6-977f-920df5a4eb01/how_to_write_effective_business_correspondence.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_4202b1689f12439daf5a5a359df6e531.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2034e4f46df14aa49b2dc46e08bb75b7.pdf?index=trueIn PDF document text
    • http://dujulekofolurad.rf.gd/puxegag.pdfIn PDF document text
    • http://salorejim.epizy.com/remove_bookmarks_from_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601d7ec5-dea8-4922-884f-27a452527625/how_to_fill_bobbin_in_singer_sewing_machine.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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 5292 bytes
SHA-256: 54ca69bfda6ad8cf89a208bb81c55cf0e3926b76038822717a7bf1cdb02174cb
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 12448 bytes
SHA-256: e0c7db9e87d3425b97d62905ef482840ff14032790ec62972d5270843c69c30d