Malicious PDF — malware analysis report

Static analysis result for SHA-256 a858f8277aed23bf…

MALICIOUS

PDF

62.7 KB Created: 2021-02-17 19:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 619cf37c85d0a4fd5eba502ed52f0ce4 SHA-1: 393768ec79bc0cc11298e11c4e5fbb5396e3d154 SHA-256: a858f8277aed23bf9d5cc6fdcab13f6bff6a5051210c64a850b40d13e3eb97f4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a textbook, suggesting a lure to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=discrete+math+rosen+8th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ffa6e609021f.pdfIn PDF document text
    • http://wexakevo.22web.org/history_timeline_template_blank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_5ffec11ba258e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fdf0e6c87ffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fd05312255a6.pdfIn PDF document text
    • http://foxiwirilavisan.22web.org/sanojif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fefdf6df12db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_6004c1ab87420.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/tugumeb/jipoxodejaziviridoviloxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/apsara_aali_full_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/nesejivavuludovu.pdfIn PDF document text
    • http://tabojiterakan.rf.gd/how_accurate_is_the_swing_caddie_sc100.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/zefatolelojomone.pdfIn PDF document text
    • http://matujuluji.epizy.com/fokoxarafurovum.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/47315595222.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/kijirufejegok.pdfIn PDF document text
    • http://tavupovasar.rf.gd/math_book_answers_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/19379215468.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/xovinigixodezijo.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_off0000b937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB937 5340 bytes
SHA-256: 899cd315102ce70ad340e0d5f6a393c0a10e8b0f13e3f78a6fa7c3c127928514
font_01_sfnt_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 10116 bytes
SHA-256: 842a7d16ad265fb0436ea28ae534043ef35e7f310e5e9af9c4517973b04f73dd

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