Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7febd8e8da1c9f1…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 14:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a6509a41d5004036d91726bf0facfae5 SHA-1: 992cd924de87a00e314b69716ec48cad7f6d1850 SHA-256: c7febd8e8da1c9f183f34217ab6bf4695f1684bb0abae5f6efa8742749eea8e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one pointing to 'jacksth.ru', which is likely part of a phishing or SEO scam. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=usanetwork.com+activate+nbcu+firestick PDF link annotation
    • https://cdn.sqhk.co/vonezositixi/tiifjbF/ghost_racing_formula_e_apk_download.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/4505157.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/beb587948c7f.pdfIn PDF document text
    • http://dabejorugorazom.22web.org/71525250273.pdfIn PDF document text
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/wexobu.pdfIn PDF document text
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/d764cfe19e9eb2.pdfIn PDF document text
    • https://fizegebukuri.weebly.com/uploads/1/3/1/4/131453213/6130138.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/gozanugi_nodagojuj_fixopezuwufuj.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/gelisifabezo-kokugajivasorav-sukuk.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/duxebomarigafin_dekitevolesaji_kodel.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/vibasujefir/66077968827.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/can_i_use_wd40_on_wahl_clippers.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/god_of_war_free_android_mobile_game.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/levewuvikalajoza.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/autocad_excel_lisp.pdfIn PDF document text
    • http://sanemogoxidiwus.epizy.com/7216291916.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/access_control_list_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/education_board_result_2019_marksheet.pdfIn PDF document text
    • http://pelazem.rf.gd/43917562653.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/ncert_class_10_maths_formulas_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/key_terms_chemical_reactions_worksheet_answers.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 5372 bytes
SHA-256: 067671856d7601f773bcf73e9bdc218a7d6f29bbd84c17e3ab23c3da6d41227f
font_01_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 10036 bytes
SHA-256: f99cc99218940e67a2a476f875099027bab7d67200877d3aa113ef8c315269ee

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