Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6155653d0590fb…

MALICIOUS

PDF

82.6 KB Created: 2021-03-09 20:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a4c4dbad8078c1031656b8961c884ac1 SHA-1: 941b287dbad4ac3c012fc3b9a6d34d1204357f2e SHA-256: fb6155653d0590fb6d40f2a376a6508938e9a93c7b4b5f6b44e21b4679836f40
214 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=who+viewed+my+profile+apk+old+version In PDF document text
    • https://cdn.sqhk.co/jojojidatun/dgdWiSM/fish_aquarium_supply_store_near_me.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/sig_sauer_owb_holster.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/86006685465.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_to_get_better_mpg_5.9_cummins.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/c2jjOme/gasoruzesixegisuk.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/reduduzopip.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/frha0Fi/kilumubudapusen.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/how_to_program_distech_controls_thermostat.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/what_to_put_inside_a_first_aid_kit.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/lolijexejomak/9833908643.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/online_pg_diploma_courses_in_machine_learning_and_ai.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/32833277342.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_267cb7b4c8654dccbf0caa8e1673c7ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/combine_excel_spreadsheets_into_one_file.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_722de56afa7d44bea8373c68f5c6e926.pdf?index=trueIn PDF document text
    • http://xomapagovujux.atwebpages.com/panasonic_kx-tgc210_white.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_4c79a122dad6426298863d80c47c5ffb.pdf?index=trueIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/dazinopadonokisosep.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_09f3fa6718474c7fa9d048438a656f23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/6270398503.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/47045488983.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_7b4280c2a56849ce9ee1090a0445b506.pdf?index=trueIn 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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5612 bytes
SHA-256: 729004d17351bfa9bc547051f41684c89cd50481c0e1cbd25769776a1f6edab4
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 2080 bytes
SHA-256: 7f5b718fd96f57a2153e301ddc7dd89e5fcdea4933e749ab3aeacdebfd26f085
font_02_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10856 bytes
SHA-256: 5b08f5bf626bdfa9b76e5d3271b3c644b289225c5e80653b662dfabe91b1c116
font_03_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 17984 bytes
SHA-256: 317af57f556fb55be522a11ec3133650733e5faf50654d2929f952998d929103