Malicious PDF — malware analysis report

Static analysis result for SHA-256 5093487a4df658fb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 22:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2eb35e88b7b91eb75ec5b07f465705ea SHA-1: fad71f35e71240b054b3191c9897c1f34f080fb7 SHA-256: 5093487a4df658fb791a9d3fc20f0b14b20033c8608d5598dc1a5db3ffec776c
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to downloading a PDF, likely to facilitate further malicious activity or phishing.

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://nipisod.ru/award?keyword=automate+the+boring+stuff+with+python+book+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488569/normal_5fe512c1a2795.pdfIn PDF document text
    • http://efarbok.xyz/summoners_war_codes_todaymfan9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_6013bb0ad6adc.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/history_of_the_world_part_2_imdb.pdfIn PDF document text
    • http://zavodtriumf.com/goverijubiwivivojobizodggybi.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/21189538931.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/rupuzulorixijolegofel.pdfIn PDF document text
    • http://astrology-personal.online/60317975165j8gb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_60380e09c626b.pdfIn PDF document text
    • http://indir-kazan.com/kexuwivirazikapaq10t1.pdfIn PDF document text
    • http://vsedlyatebya.xyz/business_application_letter_sample3cklm.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/dj_mix_ganesh_bhajan.pdfIn PDF document text
    • http://jakivuxevova.22web.org/hp_deskjet_5150_printer_service_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_604a767991600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_6035ef3f06bd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_bf23e769e4984a839cba25acb9eec6b4.pdf?index=trueIn PDF document text
    • https://db6d3479-2aeb-4a59-914c-1f55c48648c8.filesusr.com/ugd/9f5433_a35a7afc142a428f9a0789c03dd1c916.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/boveduposuxuxoleneb.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_fa89b8f1da2640529bb7427c6dc5b28f.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_f48e4b5680a8492ea541761f38e5388d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/ligetawazifenajabujifekig.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_caeb572f260943c1b1314ab5d2626768.pdf?index=trueIn PDF document text
    • http://fepoxojosatomu.epizy.com/8th_grade_history_textbook_california.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/catholic_apologetics_101.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/bus_simulator_2015_games_apk.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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 5844 bytes
SHA-256: 0362cf0a360e6ec4f9bf07175e3e58ce70d3816adbf366b5395927662fdf3656
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11312 bytes
SHA-256: a73eb26ae75b166750776b60b5d8cb4962504ba6c59c31a62d640bd8f1d79bbb