Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c3c2e6dc231ccd…

MALICIOUS

PDF

160.5 KB Created: 2021-03-11 20:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1636d83a9ae5c2c98825bf1f8cf6060f SHA-1: 53dde7d746639a87d67543985456e65f104c2d4a SHA-256: c5c3c2e6dc231ccd4f88745ee8fa031f6144a1c2c3f983257af14b8e0d25ebb9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kuzutuzo.ru/123?utm_term=lotus+spreadsheet+to+excel PDF link annotation
    • http://mif-smeh.space/crack_bones_in_backca3tc.pdfIn PDF document text
    • http://draiwenstore.online/wejutugic383s.pdfIn PDF document text
    • http://gezinuloxi.22web.org/23_cnidarian_diversity_polyps_worksheet_answers.pdfIn PDF document text
    • http://reform-st.ru/suny_wcc_faculty_emailge5or.pdfIn PDF document text
    • http://xviiivbgz.com/xixawaxepuxiriayys4.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/q9.what_is_the_essential_condition_for_the_addition_of_two_vectors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robebiwasufilu.epizy.com/86869842319.pdfIn PDF document text
    • http://lojawesepex.rf.gd/baxezobugulenamuwurawon.pdfIn PDF document text
    • http://residarifuwus.rf.gd/zasijotupotukojovutatixoz.pdfIn PDF document text
    • http://bajivuselome.epizy.com/character_analysis_of_maggie_in_mill_on_the_floss.pdfIn PDF document text
    • http://kivutivepew.rf.gd/anatomy_and_physiology_coloring_workbook_12th_edition_answer_key_chapter_5.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/bomomarepiw.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/funza_lushaka_bursary_application_form_for_2020.pdfIn PDF document text
    • http://raselitabak.epizy.com/calories_in_panda_express_orange_chicken_bowl_with_fried_rice.pdfIn PDF document text
    • http://rugilunu.epizy.com/how_do_i_install_my_canon_printer_without_the_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/36155271616.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/adobe_spark_education_guide.pdfIn PDF document text
    • http://musezuw.rf.gd/xupenes.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/45109479001.pdfIn PDF document text
    • http://noxudovo.rf.gd/21375331583.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/fluke_meter_115_vs_117.pdfIn PDF document text
    • http://rebamasisagu.epizy.com/combustion_reaction_chem_worksheet_10-_5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8D7 12664 bytes
SHA-256: 38c995b6e6a5526fb1dddab3e7c6f46398e24ca42d2208de1f6919c7689b4fd7
font_01_sfnt_off00022292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22292 5168 bytes
SHA-256: 75e0069d2f95ce46595985189aeca881f752e5e50baa96288cf767a400fd0cdb
font_02_sfnt_off00023426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23426 12652 bytes
SHA-256: bbb09b55fd4853c86a570d7b1fd93f97d82aa8f6a673fbfe4cf6784d11195b24
font_03_sfnt_off00025ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EA6 16108 bytes
SHA-256: 3f1feba1b66c730973eb7d8b415aba49596257bedbb356b8aa362dc698d22b5f