Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b53b358ae845064…

MALICIOUS

PDF

75.5 KB Created: 2021-02-26 13:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a14bfdea3bcf26cc1de5d52506d25712 SHA-1: 05e1c655c206022d2762f5cee1aee60ef466c667 SHA-256: 9b53b358ae845064dd069396d2d43a4369e64bd833405302fe241e26afd11c0c
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'zajinet.ru', which is likely part of a phishing or scam attempt to trick users into visiting a malicious site. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URL.

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://zajinet.ru/strik?utm_term=hoover+turbo+scrub+spinscrub+50+not+spinning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404959/normal_602c30dcc9db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_6020408e28ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_60205a73a5bdb.pdfIn PDF document text
    • http://beautysss.site/defensa_siciliana_ajedrez3i5a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5feb01d44f43f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ffebcaeaca36.pdfIn PDF document text
    • http://springtea.space/connection_game_in_tamil_with_answersbab5.pdfIn PDF document text
    • http://italystore.pro/zapujosazuvulerikoxiwiv8236g.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/sizadagazagaj/dream_girl_movie_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/jofovevuwuru.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/benny_and_the_jets_piano_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/8889825278.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/75641057420.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/macos_10._15_gm.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/altura_uterina.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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 5284 bytes
SHA-256: e04169786be116e912394b49553aacdeaa30f27b3415f712fba5629f964fe804
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10560 bytes
SHA-256: 0905ce26bd56f8fecb2db1581ed3325ec71f515b0370a1268abf084c8156f5a2