Malicious PDF — malware analysis report

Static analysis result for SHA-256 26341bf2525a11a1…

MALICIOUS

PDF

151.3 KB Created: 2021-02-27 20:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 997ea85e6cf453cf8ecc920ce9a80ed5 SHA-1: 2fb1dfebd3d6383ecfdb114889dbcf37a33e07ab SHA-256: 26341bf2525a11a1237ea8baeb36bd0c0950d3b23ecb571a61a148cab7e49e90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a deliberate attempt to obscure the final malicious destination. The document body, though heavily obfuscated, suggests a lure related to 'Nutcracker the story of clara synopsis'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://zajinet.ru/strik?utm_term=nutcracker+the+story+of+clara+synopsis PDF link annotation
    • http://podeves.xyz/1218975930967wpk.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/i9oRhcZ/vocabulary_builder_improve_vocabulary.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/aKrhgll/beautiful_hd_wallpaper_for_mobile_phone.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/137724900733uvxp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470977/normal_60074a9709107.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/ijQ5hjz/unknown_fate_gameplay_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fe4da7b89fb2.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/15818274300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600b4c0cdaf9f.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/q37rjjc/zujorim.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/TQkzASD/best_controller_for_xbox_cloud_gaming.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ADPje9e/iowa_storm_damage_pics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopugorib.onlinewebshop.net/tukako.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/how_to_reset_corsair_k95_keyboard.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/xizefufirasawojapaj.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/31009465565.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E61F 2856 bytes
SHA-256: ede077bcf9d936b2deabd1ca36e5cf164b77d75f1467ec74ab7a8d43bb048d6a
font_01_sfnt_off0001f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F04A 5240 bytes
SHA-256: b25d678655685b3cf6fbd787145fc9e223bc153c1994f242806b85a2b4c9e6e7
font_02_sfnt_off0002022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2022A 18980 bytes
SHA-256: 51a2ffdfe62b31f69fab3d4080fbdd008a7c4670820b83ec67d44969168d5a07
font_03_sfnt_off0002390d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2390D 16236 bytes
SHA-256: 1bbeb6027a04974ccff731e6819bd6316d0ea9ec9d8433886ce5a7e5c88ba25a

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