Malicious PDF — malware analysis report

Static analysis result for SHA-256 59890832bc65e87c…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 23:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a471bc6626ff10e87529c685f787ac8f SHA-1: 282274eac1cb85519524996640011c5e596b6d5e SHA-256: 59890832bc65e87cdecc7b8cf39cce2a17206ef34202ed3e1fddc0a561bbd8dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as a phishing trojan by ClamAV. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=richard+cory+analysis+essay
    • https://cdn.sqhk.co/xenaporo/dujhhg4/mizejibede.pdf
    • https://cdn.sqhk.co/wifenepomojo/jjg6AYh/92354790022.pdf
    • http://avto-document.site/extreme_adjectives_pptggdfp.pdf
    • https://cdn.sqhk.co/puwetudul/wgejh7j/sad_emoji_wallpaper_for_iphone.pdf
    • https://cdn.sqhk.co/nomelafu/Lgiiagd/18016990650.pdf
    • http://usblighter24.site/how_much_does_a_9.9_hp_outboard_motor_weight74xcu.pdf
    • https://cdn.sqhk.co/tixunadegu/jgigEfw/configure_synonym_and_antonym.pdf
    • http://asta-stroy.ru/nojazijukuxipiph1fge.pdf
    • https://cdn.sqhk.co/konajera/kDjajaJ/sixupatuserulejodupiboj.pdf
    • http://joy-todays.online/ledugiselejawacwx1j.pdf
    • https://cdn.sqhk.co/tadanopi/R7Xhh0W/83840758.pdf
    • https://cdn.sqhk.co/juvebuzizej/igibFKf/banished_colonial_charter_1._75.pdf
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/ziroritepasen-woximesuri-xinakaxubarez-sonenul.pdf
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/4270785.pdf
    • http://complect-tech.ru/xizanabanulazadk16f0.pdf
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/805643.pdf
    • http://rulabalelenifop.iblogger.org/complicaciones_toracicas_del_absceso_hepatico_amebiano.pdf
    • https://cdn.sqhk.co/wuzededoz/g85jfgf/raja_babu_bhojpuri_song_full_hd.pdf
    • http://nelefir.22web.org/como_aprender_ingles_sozinho_em.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gasodamuza/43529702577.pdf
    • http://vemameb.epizy.com/formulaire_aide_au_logement_caf.pdf
    • https://s3.amazonaws.com/fefurorobumi/bedingte_formatierung_excel_2010_farbe_ndern.pdf
    • https://s3.amazonaws.com/gekojulog/what_is_the_average_army_reserve_retirement_pay.pdf
    • https://s3.amazonaws.com/dobikasukavu/stop_form_submit_using_javascript.pdf
    • https://s3.amazonaws.com/mukut/58817719687.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_off0000ebf3.bin
2b86dce39860b7a02ffdd5b992a5e58d26b228007d0f3cc6a80160634cdcd1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 5136 bytes
font_01_sfnt_off0000fd6f.bin
e0491658740b7ea1a851e65248fbf592f8f40103c8071f0e1fae356da2a77523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10816 bytes

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