Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a3a9bb9f660433…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 08:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e5eaac91fbba38907d25ffa804f7b9a SHA-1: 1808300a6289a9d12193b05efacfb50af9e24621 SHA-256: 66a3a9bb9f6604336025c2e5322ecd9adb8f69106d195223541a4154fc5687ff
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 0.9993

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://dafemum.ru/123?utm_term=my+boy+gba+emulator+games+free PDF link annotation
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/geloto.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/5263757.pdfIn PDF document text
    • http://vupirure.22web.org/java_swing_gui_programming.pdfIn PDF document text
    • http://danivufulof.iblogger.org/android_studio_3._5_navigation_drawer.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/puxoderadizuwumil.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/nedefaxidefanib-wirukeg-juribug-pakopuladu.pdfIn PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/8f2e345c987ffa9.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/df3180962d4398d.pdfIn PDF document text
    • http://nigigalewo.iblogger.org/mixatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rumezo/32506596642.pdfIn PDF document text
    • http://buxamojajowolos.rf.gd/vusamukafazefopul.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_0d4b0e4323b24a1db1d71c650904b3c3.pdf?index=trueIn PDF document text
    • http://widagutevutedik.epizy.com/el_conde_de_montecristo_pelicula_online_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/wefobadaposudel.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_c5455b14906342bdb992a91e26084266.pdf?index=trueIn PDF document text
    • http://sidumekubasib.epizy.com/79202203211.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_96e17a4ca90b47dca04360d85cc5946b.pdf?index=trueIn PDF document text
    • http://zamutodud.rf.gd/dolonokeri.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_04cd034d688247d7a6fc6e8c7fd70e85.pdf?index=trueIn PDF document text
    • http://rodujuvutadaxam.epizy.com/cid_episode_2018_mp4.pdfIn PDF document text
    • http://nixewawomito.epizy.com/restraining_order_oregon_forms.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_9959c4bc25be40728511fab9e99c3ef1.pdf?index=trueIn PDF document text
    • http://milibelibagusez.epizy.com/89156348110.pdfIn PDF document text
    • http://gelifadewew.rf.gd/war_of_the_worlds_2_the_challenge_episode_1.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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 5332 bytes
SHA-256: 9e25852baf7eecf84ddf882d064c97e3df170e994ee04e60a104c0aaff2a160f
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10788 bytes
SHA-256: eea6a1e033897797dc18174f877b3cba4f1d585139706694d31d284e7a5d380d