Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499ce712e3305d6…

MALICIOUS

PDF

96.8 KB Created: 2021-03-16 11:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b70ee3f9b66b4e76c4ca9ea5f42fdc5 SHA-1: 191f1cbc26b9cfa32a9651bed5d3ef104fe94935 SHA-256: c499ce712e3305d68da33a5760cc8b2ed08f3b4876c903fdc0a773b698ee7052
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 0.9988

Heuristics 7

  • 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 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.
  • 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://mezovuduw.ru/123?utm_term=visual+studio+code+sql+server+format PDF link annotation
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/271f2.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/sojaboxepase.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/lunajegofi_ladikijawoketen_kuwokulu_wujoruzubekakux.pdfIn PDF document text
    • https://jobuvurivoko.weebly.com/uploads/1/3/2/6/132681743/fifabewapezotu-lavopuwejamiku-zelanavegosuwu.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/pumivudetopaxatanu.pdfIn PDF document text
    • https://rofizikijomosuj.weebly.com/uploads/1/3/4/0/134012810/sevufuxiv_xixosozi_zodegadokajukan_jatolipudup.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/punamapadivus.pdfIn PDF document text
    • http://krepezh.guru/apc_back-ups_pro_1000_wont_turn_on0e4zb.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/71c7e31cffe8cee.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/55029032179.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/62e29d43acf9.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/vokupazo.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/okimat_2_remote_programming.pdfIn PDF document text
    • http://kawlites.online/37351883457e7a9w.pdfIn PDF document text
    • https://zegoliro.weebly.com/uploads/1/3/2/3/132303320/zamirijev.pdfIn PDF document text
    • http://swiss-gear.store/convert_pc_power_supply_into_a_car_battery_chargerixi20.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/silaluv.pdfIn PDF document text
    • https://gudosotavuna.weebly.com/uploads/1/3/4/7/134722070/3765487.pdfIn PDF document text
    • http://mybiol.site/bhu_bsc_entrance_exam_syllabus_20192uur7.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/e2a97c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/cost_accounting_a_managerial_emphasis_chapter_4_solutions.pdfIn PDF document text
    • http://wenares.myartsonline.com/netgear_wnr3500lv2_firmware.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/how_to_write_an_evaluation_report_sample.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/accounting_principles_and_procedures_pakistan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 5320 bytes
SHA-256: 3ebaae179173f781d762c78f05f440336674e666b20c1bda3c2ca760499d0ea8
font_01_sfnt_off000136c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 12108 bytes
SHA-256: dbfc006f71e4db360bf0908476b3690f86a30310e5b38bbfd67de9c514b1c6f2
font_02_sfnt_off00015f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F73 16460 bytes
SHA-256: d975aad05103e6e5903d34981b043fb1fb57f4c56d562641d58fe6d22a3d0398