Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed5d06cf2573947…

MALICIOUS

PDF

80.0 KB Created: 2021-03-10 07:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff8cea72968015eb6cec04b16a83523 SHA-1: cc433d69d8aa648bb25749fa9d4f3e9e88b4422b SHA-256: 4ed5d06cf257394789208cb14939d1426e23dbaaa5e145c7a2a7a464d1538590
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to an attack pattern focused on redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=what+is+io+in+computer+programming
    • http://vebifitapex.mypressonline.com/duwawifamaf.pdf
    • http://bakelenodizaro.iblogger.org/virginia_corporation_bylaws_template.pdf
    • http://volulolusawaz.mygamesonline.org/8th_grade_math_eog_released_test_2019.pdf
    • https://cdn.sqhk.co/xeloxilava/Phoieji/49589766030.pdf
    • http://pumujavebedopa.iblogger.org/memalutiduruzuzuduwasu.pdf
    • http://veruvipavopa.getenjoyment.net/21494054642.pdf
    • https://cdn.sqhk.co/bexefoboxevi/jjfnibE/daper.pdf
    • https://cdn.sqhk.co/kosadara/bihMRsq/pictoword_level_530.pdf
    • http://javaxirivibewi.mygamesonline.org/bomigojufamoxudelase.pdf
    • https://cdn.sqhk.co/wazofovam/eijXPjc/26651447432.pdf
    • http://topvideo.design/fazexaxus5f9a.pdf
    • http://sarhello.online/12071702152f8rea.pdf
    • https://cdn.sqhk.co/setinapas/eMpWgeL/crossing_the_line_movie_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_77e654750a9f47a8a7c246a55de14a47.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_6df5d4afc8614e26930d04acfcf99fca.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_4a6191d4ca284c8abf8bb03435574e9c.pdf?index=true
    • http://vatamutotomo.epizy.com/all_computer_hardware_training_in_hindi.pdf
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_f76a169aa79a494ba61c4f49cc1bb32f.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_6197362a7c864130af4f46f39dda75c1.pdf?index=true
    • http://pimokizogo.epizy.com/drive_incubus_piano_sheet_music.pdf
    • http://motirovaribepok.rf.gd/rurejo.pdf
    • 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_off0000fcb1.bin
414ba603f9e3a56569299b8a61a7f52d7521b1b1ed60cd267515333911034c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 5328 bytes
font_01_sfnt_off00010eb3.bin
bc9f29922e8bfd02bb5eeafe5f9faa3f95ed2350482ca7560168e0271fac8219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 10544 bytes

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