Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90e06eae665154…

MALICIOUS

PDF

157.4 KB Created: 2021-03-10 15:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e0651824fad2e95fa76c6866bd157942 SHA-1: 2624c02996e47980063e0ef9b631a995599b5119 SHA-256: ac90e06eae66515479d2d00b25a52e69b1fc5ff8b010698dc4ed91a291e341fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a book title, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=harry+potter+und+der+stein+der+weisen+zusammenfassung+kapitel+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463554/normal_603015efa2971.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/a7pfii8/76769264287.pdfIn PDF document text
    • http://czecheducation.space/jurupedazubmeg.pdfIn PDF document text
    • https://cdn.sqhk.co/vexapalas/gieiahg/homescapes_hack_stars_and_coins.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fd0d9babb3ee.pdfIn PDF document text
    • http://summer-italy.fun/how_do_you_clean_infrared_grill_grates0zrjw.pdfIn PDF document text
    • http://crawlmqyu.space/to_have_or_to_be_erich_frommvvv9f.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/jSfEzhg/alien_creeps_td_epic_tower_defense_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/hajbPyl/nakaxowil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fca78579068e.pdfIn PDF document text
    • https://cdn.sqhk.co/navezige/dhciihe/70769466613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5fca5c2e02279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5ffdc69234264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_602761de26233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d93cc52d-13d2-448c-8ae9-db8373dc2d93/nakemesuworo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8a7b28-4f3b-452f-aedc-63fcd3251fba/xokodomikutumipifitavov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19863210-1238-472e-ae4d-3e6e2d0d2fa4/nakamichi_bluetooth_speaker_price.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/spell_slots_when_multiclassing.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/latvia_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/dragonvale_breeding_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d829cf7-f77b-4c8d-a966-a0a40b2a3914/how_do_i_setup_my_centurylink_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e144b6-b0ba-41a6-a1fa-9584379fc0c1/ratio_maths_worksheets_gcse.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_off00022a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A1D 5764 bytes
SHA-256: f5e4034a1f28577d8ede7fd4d385dd24c0968a1649ea3b3c6ac2f52030ee8900
font_01_sfnt_off00023dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DD1 13232 bytes
SHA-256: 0c13e47ec0e45ce3969ac4a97079c70d177a50ba0b185f1ad283e7f12e1413e6

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