Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6f4d70458f1998…

MALICIOUS

PDF

86.6 KB Created: 2021-03-22 00:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2a3cd11dc06f2f7f0d02a913f0eedd54 SHA-1: 1369395a532e0b65bbfe392d2ebf6dc1b9b4dd26 SHA-256: 2b6f4d70458f1998a1b57e87780bd4ffc3e709839b334b863451549d32c5e817
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it may be part of a link farm or used to distribute other malicious content. The document body, though heavily obfuscated, presents itself as sheet music, likely a lure to disguise its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://soxebez.ru/123?utm_term=beginner+clarinet+sheet+music+with+letters PDF link annotation
    • https://cdn.sqhk.co/jaxabofapuw/kjbjdEr/2384821536.pdfIn PDF document text
    • http://sravniproxy.info/gelawilojeterezoliix8z.pdfIn PDF document text
    • http://byseles.xyz/hands_of_light_barbara_brennanqgmqi.pdfIn PDF document text
    • http://eurostore.info/mivonukudim0e4mg.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/125_best_gluten_free_bread_machine_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/hbjiFKj/yenthavaadu_gaani_movie.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/simile_metaphor_personification_hyperbole.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/ELheACj/hello_neighbor_walkthrough_act_3_wrench.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/bU9jfGq/auto_auction_appleton_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/eNRaXb5/fupudesajowimikatave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_42246bfe8a7f4affaae98b566187ae30.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_08324b4fd48e42daaed312d1fa0bd218.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunojipu/5671589400.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_e47b944c87ed48cbac74996734d1af82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_create_acer_recovery_disk_windows_10.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_7564d75fe3aa4885ac4950e595387340.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/91891481341.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/79289592445.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/how_to_find_stock_option_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/japan_tour_guide_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/rush_tom_sawyer_album_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/definition_of_christian_leadership.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_04d39e48c3a0421fa8df7e390b8eeefe.pdf?index=trueIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/degoradidaje.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 5124 bytes
SHA-256: e0c98030cf08c419294a05919fcfdfec2044561c0f299529f64ec559c1137af8
font_01_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 11304 bytes
SHA-256: 60280fabb0797c2a1878875463d9412e3fb6657988ffa31afb7ab9ce143c7679
font_02_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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