Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1131fd3279febba…

MALICIOUS

PDF

91.8 KB Created: 2021-03-29 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba08a4b07c6d861db101affb1d721586 SHA-1: 52c3490483a67c1eddb258d7ebc597b8a0b7fed3 SHA-256: f1131fd3279febba3a1c0f6e4e0c4dad80bb2591dd841952791adb95ea70a442
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/strik?utm_term=will+durant+story+of+civilization+complete+set PDF link annotation
    • http://dasezin.getenjoyment.net/vegetation_zones_in_nigeria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_6034cb48901a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_5fe872c9b0cb0.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/nR1iaib/ranuxofelotuz.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/cDsDgi4/campus_data_sim_hack_android.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/fiduvuruwi.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/ggcyjeq/retro_race_car_ltd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_6024cd0f6e44d.pdfIn PDF document text
    • http://bexibuvisez.iblogger.org/godonepidus.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/37689303392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ffc4dd312272.pdfIn PDF document text
    • https://cdn.sqhk.co/wibepudib/djajbjf/jirovafevepasajelogijetad.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/sowewazulejewi/how_to_reboot_cisco_router_from_cli.pdfIn PDF document text
    • http://zajepatexesa.epizy.com/70539945542.pdfIn PDF document text
    • http://vanudedu.epizy.com/wanted_poster_template_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/rock_band_4_wiki_song_list.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/pizubuxodadevesut.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_2aa480eb3d494885a81e4c603e2f8809.pdf?index=trueIn PDF document text
    • http://bokazoniwojuwod.rf.gd/mac_os_high_sierra_10._13_dmg.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_54dc35465da24f85856bada146395d58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/42929506581.pdfIn PDF document text
    • http://javewexo.epizy.com/91084372462.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_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 5528 bytes
SHA-256: b146d74cc9512b928c3b5e61ae850982bc5472974fba7caeaad1d2b7488dd9ef
font_01_sfnt_off00013b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9D 11272 bytes
SHA-256: 88f13699e702537f1fa72049d12e161dd21efe5943f6d9ec3431d3752fa97e28

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