Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcd6da7255155a6…

MALICIOUS

PDF

115.3 KB Created: 2021-04-29 15:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44e6a41c1959b733b194e3718eca92a4 SHA-1: 745e8df3df3b6a65d572f7280a9459b17ad5e8a5 SHA-256: 1dcd6da7255155a62746cc3b0136d5e3a1438291241bddba15d7107f84ade044
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9983

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://gimoguvi.ru/strik?utm_term=mechanical+engg+jobs+near+me PDF link annotation
    • http://vorgazme.com/ideal_gas_law_problems_worksheet_answer_keye4fqy.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/DCHuhbL/rocket_launcher_ark.pdfIn PDF document text
    • http://repair-monokoles.ru/jeffreys_bay_surf_report_windguruebyt3.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/fhhMgfN/db_train_simulator_mod_apk_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/lAXmmgc/piano_sheet_music_books_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/gjaXHjb/88647477013.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/lYGbgjE/81346584995.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hjqhifN/offroad_jeep_simulator_4x4_off_road_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/sWI2icZ/hospital_pick_up_lines_tagalog.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/assignment_of_contract_form_floridaptp0c.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/ZjeUT5e/word_scramble_decoder.pdfIn PDF document text
    • http://amst-watch-v2.club/what_are_some_major_landforms_in_australiaeq017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/suzujewa/blitzkrieg_2_free_full_game.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/world_of_warships_captain_skills_guide.pdfIn PDF document text
    • http://jazeduvarepuvas.rf.gd/63406605783.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/23578034008.pdfIn PDF document text
    • http://mevukesamuzu.rf.gd/11250093477.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/ordering_fractions_from_greatest_to_least_worksheet.pdfIn PDF document text
    • http://zenuvivasefum.epizy.com/sibogaj.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/87483679387.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/lagu_dj_asmara_ines.pdfIn PDF document text
    • http://ludilisi.epizy.com/41161855729.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://www.gnu.org/licenses/gpl.htmlIn 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_off000155bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 5436 bytes
SHA-256: ba028776a911dbc367d46dfed754ae13af941529849a80ec3d6f78a2ed4b0dc8
font_01_sfnt_off00016810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16810 9360 bytes
SHA-256: 7168ea0d6d1f8e361993b515c99fac11d1d20879eeff66f83dc425ddc1303a05
font_02_sfnt_off000181f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F2 11420 bytes
SHA-256: cac6d3cd79c201f496419900821cda3c242aaddd39278f7803becb682b997f2f
font_03_sfnt_off0001a92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92A 16216 bytes
SHA-256: e2e3d1051de8ddbff4c5403344dce7147ee707e0457668c585c9d9eaba6b6284