Malicious PDF — malware analysis report

Static analysis result for SHA-256 981075a4b059fd0d…

MALICIOUS

PDF

70.6 KB Created: 2021-03-06 22:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89b47daf70f3c922c0e2e0623c09d06a SHA-1: 31f0d2ce3d05ecd17d1b87c308fd95b0dab1cc26 SHA-256: 981075a4b059fd0d60c101dcf412ade1bf997fc8638478a55b2da3cf2b75dc04
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-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
  • 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://pelibifir.ru/123?utm_term=how+to+define+social+justice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6020936fa0fc1.pdfIn PDF document text
    • https://kurixaxewa.weebly.com/uploads/1/3/1/3/131383664/voloxubuvaj-kopepitesezakob.pdfIn PDF document text
    • https://pikiravu.weebly.com/uploads/1/3/4/3/134347639/bejamavofobemu.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/4618480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415546/normal_5ffb5bbec993c.pdfIn PDF document text
    • http://detonic-buy.website/peoplesoft_accounts_payable_business_process_flowsmd1r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_602c3423c5db1.pdfIn PDF document text
    • http://eeeeeyyy.space/analytical_skills_bookszihxn.pdfIn PDF document text
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/62652d78718dd12.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/mibalu.pdfIn PDF document text
    • http://iqecoportal.ru/xawajotujigavezemuoylul.pdfIn PDF document text
    • http://legiontry.online/fifty_shades_of_grey_3_full_movie_download_filmywap4ym2f.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/cjhOWhh/65404363991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5fd08229d0c29.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/1gihig8/two_player_games_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_6007af5bb3916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovenole.epizy.com/what_does_amp_error_mean_pioneer.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_49c0f5bd2abe4aedbb54c5042b08f9cb.pdf?index=trueIn PDF document text
    • http://najorenowodume.epizy.com/affidavit_of_service_form_arizona.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_dc7cceff9dca41d284a061b1adc3ddc5.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_95bcfd752605488294e2fb51bcb25598.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_587f41be1e334e47973c3ed53c29def2.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_a4808187a1b640009c502d7d7bdf9c48.pdf?index=trueIn PDF document text
    • http://maledikenuxod.rf.gd/avital_remote_start_4105l_manual.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/81615640145.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 5048 bytes
SHA-256: 2d1713068ea2cad96cc932b4060ac7c7a7704fefdcf522587a77e4e8ad1f429d
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 9668 bytes
SHA-256: 42db11fcf13369c3b1baae23521f551f51ff5c47378f973099691655f2b15607