Malicious PDF — malware analysis report

Static analysis result for SHA-256 878f05e1e8bb2f0e…

MALICIOUS

PDF

73.4 KB Created: 2021-02-08 00:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 754a71ac51beaa4a859f7f40a2698a19 SHA-1: 39c89cef6e44b866f2e6adac6c875c343826adac SHA-256: 878f05e1e8bb2f0e50382b75f3cdbeb923e9758aebf3ad7c17af78e62f54e51a
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL `https://jacksth.ru/wb?keyword=polo%20shirt%20template` suggests a phishing or malware distribution lure disguised as a template. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are commonly used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=polo%20shirt%20template PDF link annotation
    • https://cdn.sqhk.co/bobavijiwoba/DghZaje/forest_wallpaper_hd_1920x1080.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/SNJha8p/meme_soundboard_ultimate_2018_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/ehak7ji/how_does_ftdna_family_finder_work.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/iigdvgh/discount_silver_dollar_city_tickets_at_price_cutter.pdfIn PDF document text
    • https://cdn.sqhk.co/gupidiroka/qDavjcS/67207947225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5ff6bd907c377.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/bjajcij/35465175911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6010f7e824d09.pdfIn PDF document text
    • http://bonusiotsbera.online/foto_sexualnix_devushek5cc0b.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/cjj7bhh/hockey_monkey_denver_co.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/4hbZpjj/usa_hockey_age_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mizeteb/bartender_song_rehab_free.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/red_alert_4.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/edakkad_battalion_06_free.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5060 bytes
SHA-256: 8343e93057d09e11fd2dcdeaec0ad53dcbc9287f4ba5aa1fc9170dde082b9b66
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10632 bytes
SHA-256: 152a8d503b9e11925b9281c4e25e5fad7be92a12cd6cbfcc4091e93cf4461eeb