Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c112916b540f15…

MALICIOUS

PDF

83.6 KB Created: 2021-04-30 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f4bf9af138e483e6cd747dff41e9b4 SHA-1: b42ff54abd1abab4e26d40659e8b854a0bf4549c SHA-256: 14c112916b540f15034a50146fcbbd3f91119364a3cf779634dbcce039684b66
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://xezojetit.ru/strik?utm_term=most+used+gre+words+2020', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=most+used+gre+words+2020
    • http://gupodorap.iblogger.org/japanese_business_dictionary.pdf
    • http://jedomagisuw.getenjoyment.net/75273606971.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/assurance_automobile_en_tunisie.pdf
    • http://komaxinatobofe.medianewsonline.com/kenmore_600_series_washer_water_leaking_from_bottom.pdf
    • http://xifadezuzurap.medianewsonline.com/definition_of_personality_development.pdf
    • http://tesilav.sportsontheweb.net/45305827260.pdf
    • http://pozijuza.scienceontheweb.net/nikon_f5_manuale_italiano.pdf
    • http://zelumefepa.sportsontheweb.net/vasazejevarol.pdf
    • http://buvalopexur.mygamesonline.org/40419011908.pdf
    • http://wavolat.iblogger.org/52249560871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e61631e-560d-4748-8080-ac54e9e1faa4/24777391078.pdf
    • https://uploads.strikinglycdn.com/files/81a990d7-454a-4f17-b3fd-aee79fa8b0e0/pretest_and_posttest_loops.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_568fdf81f36b45c1adc78af1953a4a1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d70a338b-a064-4e15-b12b-a233ef20336f/wordly_wise_3000_book_8_lesson_12_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/a852866e-0833-4d65-981b-4753b0c60594/percy_jackson_and_the_last_olympian_chapter_14.pdf
    • http://jajoxutevo.epizy.com/maa_durga_aarti_audio_song.pdf
    • https://uploads.strikinglycdn.com/files/19bb29b1-54d3-46cb-b7e3-97173cc083c0/kill_team_elites.pdf
    • https://uploads.strikinglycdn.com/files/b3a35da3-977f-4b3e-952b-4ff2a6e1a34c/35908342165.pdf
    • http://suxanovovogemi.rf.gd/academic_calendar_2018-_19_template_excel.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_cd9974a954ab4e3bb725dc2f1c14bcbe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7fc3666e-1eae-45f8-b699-29e28a0afcb1/left_handed_baritone_ukulele_chord_chart.pdf
    • http://kipamorilezux.epizy.com/rumobiriw.pdf
    • https://uploads.strikinglycdn.com/files/7b61611c-452f-42d1-9184-c9ecbdb9853d/garmin_montana_600_handlebar_mount.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_off00010830.bin
109f0883147e40a7edad8f4928817c62e423bba1d1d129735bdfd0ab287c0229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 5120 bytes
font_01_sfnt_off000119cc.bin
5d76e7b12fe345a7b127c960b9a1e7ce1eb572cc2853698c03a11d2ee74f0343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 11952 bytes

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