Malicious PDF — malware analysis report

Static analysis result for SHA-256 855e797a206cb58e…

MALICIOUS

PDF

74.2 KB Created: 2021-01-21 15:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8d4f70056ee4b3ed32972276fc4114ea SHA-1: 564445e91e21987bfe344de11ef3bb3e61b6696a SHA-256: 855e797a206cb58ee4dbcf0ccc30be35ae0c10d122284794c782a8130a584d8e
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a URL with a "utm_term" parameter suggesting a lure related to "video billie eilish copycat". The PDF is also flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=video+billie+eilish+copycat PDF link annotation
    • https://site-1166051.mozfiles.com/files/1166051/31905052822.pdfIn PDF document text
    • https://site-1173271.mozfiles.com/files/1173271/dev_empire_tycoon_2_game_developer_simulator.pdfIn PDF document text
    • https://site-1179350.mozfiles.com/files/1179350/85738858489.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/anti_aircraft_missile_russia.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/81c531.pdfIn PDF document text
    • https://site-1168430.mozfiles.com/files/1168430/44867721562.pdfIn PDF document text
    • https://site-1172798.mozfiles.com/files/1172798/thank_you_for_being_here_tik_tok_meaning.pdfIn PDF document text
    • https://site-1176115.mozfiles.com/files/1176115/jaeger-_lecoultre_reverso_classic_large_duoface.pdfIn PDF document text
    • https://site-1172629.mozfiles.com/files/1172629/24279831251.pdfIn PDF document text
    • https://site-1178204.mozfiles.com/files/1178204/college_board_official_sat_study_guide.pdfIn PDF document text
    • https://site-1207255.mozfiles.com/files/1207255/spencer_kagan_cooperative_learning.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/ringtone_guitar_malayalam_film_songs.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/open_workbook_and_sheet_vba.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/fsH4hbu/faritujuwixoxexebep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifopufu.epizy.com/lulegazutepugidixo.pdfIn PDF document text
    • http://bipitor.epizy.com/jilomimawerezofonipu.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/bloody_roar_2_apk_mod.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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 5272 bytes
SHA-256: 2bb6edd9bc4e40168c99004d544446ec693504ada55cb6483051478b5edbb42c
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 11324 bytes
SHA-256: 0aaa8a96a126759c4510ac0068ea6307b235c1ccd6cab89b8e77f2d11da7ddab

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