Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de7b46d2d77ea86…

MALICIOUS

PDF

89.7 KB Created: 2021-03-27 17:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 878aea013fe71b5283eac73ba307ae1e SHA-1: 593cb3d62d388d36de197f94f3e1d29edfef3d9b SHA-256: 4de7b46d2d77ea86de841aba3beaed24b1310a025076beb333cd0dfc6141f1d9
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to external sites, one of which is identified as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to a textbook. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bologen.ru/award?keyword=critical+care+nursing+a+holistic+approach+11th+edition+pdf PDF link annotation
    • http://avit0.cc/bella_coffee_maker_last_brew_problem6wh8m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fe18bb64b11d.pdfIn PDF document text
    • http://kewegagibemidaj.22web.org/furcula_damage_spreadsheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fc7a7f098370.pdfIn PDF document text
    • http://dombitarf.ru/enamorate_de_ti_walter_riso_epub_gratisycbte.pdfIn PDF document text
    • http://vykupavto54.ru/corningware_10_cup_percolator_cord4qt73.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hhr6jbP/prison_escape_movies_on_hulu.pdfIn PDF document text
    • http://dodunagosukew.iblogger.org/balanitis_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/dbjiChh/xisadufibuxu.pdfIn PDF document text
    • http://stassikorskyi.com/jenodajifujabaduvajazelabgytk.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/56085535500.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/hjfhg8D/datarusevufojavuwasoven.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5ff5665c5af42.pdfIn PDF document text
    • http://opsnatur.fun/jikozelupek0vb2c.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://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_e206b33e128d453d909813d56e2b0c3d.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_882961550f1d409bb94e21d926def79f.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_1f52f48d60f243d29a088f8b250d6c9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/how_to_lose_weight_with_cardio_and_strength_training.pdfIn PDF document text
    • http://meresig.epizy.com/t_shirt_template_png_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/dowinuxijazusunubejiveb.pdfIn PDF document text
    • http://sovotovagito.epizy.com/cell_phone_jammer_circuit_diagram.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_27dd56799db3464ea970d13a60e576c9.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_d575c378f51847208078a3913c1da064.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 5376 bytes
SHA-256: aebcac43f8cd160b1ceb99b0ef1246e9d4950f2691c1c317332e0ffe2009c62d
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10800 bytes
SHA-256: ecc4717f84d7316d9f3dfa16e58beff97252b58077aa886a48b4ddceb2dc09a5
font_02_sfnt_off00012fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCF 17664 bytes
SHA-256: c6e2a59712d45920601e7968c19729d45ac8e6b038be709d18d4924edd989c30
font_03_sfnt_off00014a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A35 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3