Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89cd810ea49f40d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 11:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f5426f9e90fe4cffd50982ef582d2ced SHA-1: 9dc86249b5a201a320bee64dc928e71c2c23511c SHA-256: e89cd810ea49f40d43ed358dbbea49ee102f573b8a7cbbf0750277c1e3dadd21
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and potentially malicious hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, hinting at its generation method and potential use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=the+5th+wave+book+read+online+pdf PDF link annotation
    • http://bukenisefino.mygamesonline.org/86688310868.pdfIn PDF document text
    • http://copyrighthelp.info/igcse_economics_worksheets_freegvz6u.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/cardizem_sr_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jbtegjT/nebulous_io_pc_online.pdfIn PDF document text
    • http://sberbank.link/reinforced_concrete_design_8th_editionthqnh.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/ii9ifVE/dynamons_by_kizi_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/jgegc7w/dissertation_writing_template.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/7564775800.pdfIn PDF document text
    • http://brumbum3.xyz/26081714738abnp9.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/suunto_vyper_battery_size.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/JoijSib/61596912315.pdfIn PDF document text
    • http://astropsychology.website/frindle_book_report_coverudqmg.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/b4Yifhc/wise_eyes_dubois_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/boghmxg/std_10_science_chapter_1_gravitation_important_questions.pdfIn PDF document text
    • http://prostotit.site/taboo_filmi_tC3BCrkC3A7e_dublajxl5xd.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
    • http://lobopekogolo.onlinewebshop.net/oxford_picture_dictionary_english_free_download.pdfIn PDF document text
    • http://pubupetedibu.rf.gd/65838932961.pdfIn PDF document text
    • http://turojupa.epizy.com/30769195502.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/goxilavijopoxabevonegev.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/lajuviduvanumakoxez.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5168 bytes
SHA-256: 84f89ff5324eb2b5b6ef8af09fa30c6f8e4b067f55972e2b25d3d6de6f414b8f
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 10508 bytes
SHA-256: 14bf624d7d6ecb7ce101782fffc07f5e886af7fdef669b6110fba32dc039bd11
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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