Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12a350ca5da5695…

MALICIOUS

PDF

69.7 KB Created: 2021-02-01 23:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c01ce216cabcfd95573989e920ed4103 SHA-1: c74e8e7d8049741cf3fd5efaf4c4aa1ae04ccd4b SHA-256: a12a350ca5da569536a5531edc6b6a0273d7546db8cd08ad0d760070f2687e8a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with the ClamAV detection name indicating it is a phishing trojan. An external URI pointing to 'jacksth.ru' was extracted, suggesting a redirection to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated by a tool rather than being a legitimate document. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=multiply+binomials+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5ffd2b189a8e6.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/jdytChj/blues_brothers_swat_team_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/ictjiii/lizapezukasivikopujaw.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/1Xhjxhh/super_masks_subway_surfers.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/msELigy/aimpoint_t2_for_sale_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/uhehfnb/temple_run_iphone_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dKjfJif/yellow_anti_stress_ball_selber_machen.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/idJNWjh/colour_full_3d_free_download_filmywap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lekizopiloref/ejercicios_clases_de_sustantivos_4o_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/44661534883.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/carranza_periodontology_free.pdfIn PDF document text
    • http://jabukejezari.epizy.com/25499500371.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 5344 bytes
SHA-256: 3bf6e28e0e5c11b4fd6fdda905a285979785fd0fcd5a5d1efcb40ea6130e1925
font_01_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10396 bytes
SHA-256: 4bc341ee73d05b5ae6e43f9aed067d28541b4f21edd4042046a2832a1797a6d8
font_02_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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