Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8fe1acc8394f13…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 13:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 87d8b59a0e535fc668a2c3b52010da99 SHA-1: dac99013573b63bc317ef4a82e61741d745e1189 SHA-256: 0a8fe1acc8394f13ab8872347c74e5fe169e6ef92f30b9ec527981d909f0a7ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs, combined with the 'link farm' heuristic, strongly suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=how+long+to+leave+thermometer+under+tongue PDF link annotation
    • http://tuimag.ru/how_to_use_krups_espresso_coffee_machine5m1x5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fd5f6efef09c.pdfIn PDF document text
    • http://peludofnor.fun/2063658028816la5.pdfIn PDF document text
    • http://generatorsale.ru/how_much_does_it_cost_to_get_a_chromebook_screen_repairoyfbw.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/mbhh4Dg/organizer_day_by_day_2020.pdfIn PDF document text
    • http://nout-sale.site/nirowaboxanefuxefofu3keu0.pdfIn PDF document text
    • http://trickyturkey.com/dwarvish_translation_guide_stardew_valley0qzpc.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/4geLyha/80608267611.pdfIn PDF document text
    • http://serdyukov.pro/bajavefodatazesugilinody3j5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fc5a61b1e2ea.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/hiejxdN/33430945127.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/ahahgjg/hidden_picture_puzzle_games_free_online.pdfIn PDF document text
    • http://teaapple.space/40917101434hze2g.pdfIn PDF document text
    • http://itdiscount.pro/834852075296khqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5ffa79ec22857.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/9b46c662-62f2-4c30-a707-a9049fca3808/best_large_print_crossword_puzzle_books_for_seniors.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/1625134174.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/20789679535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21315d1b-fcd0-412b-ae66-a50d562fe46d/80177772735.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/dagiwopikikerape.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/45384615007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e351ae2e-d48c-4e3e-b59e-a2772381a5d5/nomidijijupipoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd886e8-410c-48b5-8da5-e8082edb9140/how_to_replace_glacier_bay_single_handle_shower_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/pilanarojesoz.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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 5172 bytes
SHA-256: d72d3d3ebe2292385e30ebaf3cd506fa6791735317adc719c940fca662eec7bf
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10856 bytes
SHA-256: bda8d8c5d08c35792e7e12870299e93003ed29adc8fe48d53a57152113635987

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