Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd158f40e3bbbaf8…

MALICIOUS

PDF

75.5 KB Created: 2021-04-29 03:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a0d718eedbd478194220e4ae3ee5926 SHA-1: 9a502a1c85f74f1645ce4ab4432ddfc74028dc65 SHA-256: cd158f40e3bbbaf8c140b9afd4aad70af2c087db5834962e7e76e1cf44fb1b54
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous external URLs, with one specifically identified as an external URI likely intended to redirect the user. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=tres+tipos+de+grupos+sociais PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60103f7dc2817.pdfIn PDF document text
    • http://boldly-grow.com/english_reading_book_for_beginnersxbrbk.pdfIn PDF document text
    • http://monoga.space/690235172h570l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_600905ff0ec96.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/uZ1jcha/city_warsaw_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/f5y7Jgf/51823920461.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/4ijrjib/rejedupadolobe.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/jbjcaid/teamviewer_8_filehippo_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_60372e2f079e4.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/dlhfjbf/aba_english_learn_english_itunes.pdfIn PDF document text
    • http://bagodipab.22web.org/anandabazar_bengali_news_paper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojuzafi.rf.gd/centralista_forma_de_gobierno.pdfIn PDF document text
    • http://ralepixevoz.epizy.com/31219515970.pdfIn PDF document text
    • http://todazudagupuked.epizy.com/gta_san_andreas_cheat_codes_for_pc_file.pdfIn PDF document text
    • http://morikid.epizy.com/225908130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbccd1eb-4e9f-442e-a430-358d8057a897/70493007338.pdfIn PDF document text
    • http://winupenelipumo.epizy.com/jimowow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f9fddf-f8a5-482f-92cc-d15c348cfa58/what_chronological_order_to_watch_star_wars.pdfIn PDF document text
    • http://venukaluxe.epizy.com/ireport_windows_installer_5._6._0.pdfIn PDF document text
    • http://rerorupi.rf.gd/balupu_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5756d2-43c3-4453-8c34-a2ae68045988/musical_notes_tattoos_shoulder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fab053-b78d-4473-b181-79e515efffb7/86498772923.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5156 bytes
SHA-256: 48346b8aa4bf831379d9be5c846f49ff48a01add18f55ce947de92efa68d680e
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 13616 bytes
SHA-256: 14fb2fd50c9aee4b04ce897cfbcdadf3bed225d05c9e91643bc59ddd818a7875

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