Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac8bdd3cf4ad4f0…

MALICIOUS

PDF

82.4 KB Created: 2021-04-04 17:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa342d0fbeef294ca84166e0965bbb41 SHA-1: d314c6640485982e6e55368155771df50acc1acf SHA-256: 7ac8bdd3cf4ad4f09a7b91dfd13afbcf2707c73ab5b6c34532b4c46cc5e367fe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The document body, though truncated, suggests a lure related to 'Adobe after effects shortcut keys', which is likely a pretext for a link farm strategy. The presence of numerous external PDF links, including suspicious domains like vilenefex.ru and monstergym.ru, strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=adobe+after+effects+shortcut+keys+pdf+download
    • http://monstergym.ru/ascaris_lumbricoides_cdcbjc5t.pdf
    • http://shopsmmv.site/vipuru6infe.pdf
    • http://bumaga.bz/29718873170lrzks.pdf
    • http://instasale.company/550428414926memu.pdf
    • http://podcard2020.site/18775144998c0fcj.pdf
    • http://kpupnov.pro/olympus_om-2_battery_replacement7ougz.pdf
    • http://zisujetev.iblogger.org/vijakaredan.pdf
    • http://samyog.ru/algebra_1_graphing_inequalities_worksheet_answersfw8qv.pdf
    • http://dwatches.site/is_kaplan_course_worth_itgf3ei.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f442622-82b3-45c9-bf85-2c035a5e4f31/koxolebadota.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_c4974f92a56a4b0a9dbab0aff78f0df8.pdf?index=true
    • http://gelulunex.epizy.com/vawedojomukegobulisuzoven.pdf
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_5d55f83c385a406b88436a8f015ed0e4.pdf?index=true
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_15818b15bf4d451cac6e455cb5d98a09.pdf?index=true
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_67ebbcf37e7d4bdb804d6e16577382ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43107811-d56b-4e88-a545-04eeacb96b5a/the_bloody_chamber_feminist_analysis.pdf
    • http://zotebizitiwiwe.epizy.com/the_chimp_paradox_audiobook_free.pdf
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_7c3c3626a3984c5bbfd702823fbda630.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6abe5ade-443d-40b9-b401-4e956776b084/penny_stocks_to_buy_2021_on_robinhood.pdf
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_e5c38ccd338a4e11aae46c8fcf46fd94.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_9e012dc36f97405384c67f2dcfd16785.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_59591a6a0e344a94b558185d3d0e0b97.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_8b41469dd59646a983ac553156fa7066.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab84396f-4a2a-4b47-9e7d-266d73b32bbb/xixaxetopedanaxoleduvono.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_b6fa7c1af7134e299fbe0683f73d7e3e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ea.bin
d801f6784019aaecb9f3785ca97c41161895bfcc89f4f69f93e0bb4788a9cfa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 5628 bytes
font_01_sfnt_off00011619.bin
7a5a9268734762f37161228ddcabb8e924595a049ff235fc97f6ddef8d144e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 10968 bytes

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