Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd77ebc524740b29…

MALICIOUS

PDF

82.1 KB Created: 2021-03-16 11:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f29948f3c927f844031a4bffd5ca50 SHA-1: 4b7d9d25221239211d4e2832cb77bef35f69ce61 SHA-256: cd77ebc524740b293707be31988ad292a646dee805eff53e576b2d0f428ca0e2
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing page or malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'esoteric keys of alchemy pdf', suggesting a lure to a malicious site.

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://botokaw.ru/strik?utm_term=esoteric+keys+of+alchemy+pdf
    • https://cdn.sqhk.co/muzolorakow/jieq8sN/kujawexadotivobenotasiram.pdf
    • http://dalidusiz.mywebcommunity.org/alto_sax_christmas_songs.pdf
    • http://sijemogezabusa.sportsontheweb.net/laxemoxeje.pdf
    • https://cdn.sqhk.co/muvotugi/jfjeUVC/fasekatu.pdf
    • https://cdn.sqhk.co/mujawiru/iaWhfgi/clash_royale_decks_arena_12.pdf
    • http://laribij.scienceontheweb.net/hindi_grammar_worksheets_for_class_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02254ba9-1173-4a98-a5df-47cdac50549d/how_to_acrylic_paint_abstract.pdf
    • https://uploads.strikinglycdn.com/files/5762c52f-864b-45c6-b9ef-cc16cf42d443/fatorivorunud.pdf
    • https://uploads.strikinglycdn.com/files/d8718157-f63a-44c0-b196-8fa66f25af41/523008214.pdf
    • https://uploads.strikinglycdn.com/files/a3f22142-d3bb-45cd-bf51-3a9dd18c0be5/p8z77-v_lk_ram.pdf
    • http://kikisitakas.rf.gd/d-link_dir-655_manual_norsk.pdf
    • https://s3.amazonaws.com/vavapekadoliti/simple_petty_cash_policy_template.pdf
    • https://s3.amazonaws.com/bulolimepol/another_brick_in_the_wall_free.pdf
    • https://s3.amazonaws.com/xopugup/xokatoxitupalemajupopo.pdf
    • https://s3.amazonaws.com/ropidadegaxut/credit_note_template_xero.pdf
    • https://s3.amazonaws.com/sajatesawodiji/hotstar_vip_free_app_apk.pdf
    • http://rixigor.onlinewebshop.net/2000_jeep_grand_cherokee_4.0_oil_type.pdf
    • https://s3.amazonaws.com/samopakamefap/73731771301.pdf
    • https://s3.amazonaws.com/fakuguvil/21001842130.pdf
    • http://xotujulenibol.epizy.com/4893760414.pdf
    • http://duvewukabiwetu.epizy.com/agile_mind_algebra_2_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7d.bin
a87f8553093152d082adff738e8c17ec7e2627c12a31a3b6a7dc98312590c05a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 5520 bytes
font_01_sfnt_off00011229.bin
004602c5ed7214b3c85e56843e4d29e3f48c2495f6a9f271f638b97554856b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 12608 bytes