Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50b9a98dcb4d21e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 22:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6962e0a94cfabd77ae1cd316280c48c9 SHA-1: ef9e374b7b339bcb9efbcf25b29205624375eedf SHA-256: f50b9a98dcb4d21efc5b5dcfa3ad838d9470e80fed40deefe55f2487b37d4078
146 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the document's structure and URL distribution suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/123?utm_term=tamil+nadu+land+guideline+value+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5fde5b6baaa80.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/wovakuwodixumekinematojof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5ff7954964008.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/haMhdie/block_jigsaw_free_hexa_puzzle_game.pdfIn PDF document text
    • http://kugibut.22web.org/lufajawozesuki.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/DzhiChb/cbse_board_class_9_bengali_syllabus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60223e4a017c6.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hjhjewL/fearless_wheels_apk.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/97137320704.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/K7hbnic/procreate_fill_tool_different_color.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/fiwogulumafalopipav.pdfIn PDF document text
    • http://buzovanukoziba.22web.org/xiaomi_redmi_note_5_android_one_rom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6043612e2d415.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/pobolirelesi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5ff9144cace57.pdfIn PDF document text
    • http://kemijejanurag.iblogger.org/veterinary_nematodes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xexapofibej.rf.gd/ca_dmv_written_test_answers.pdfIn PDF document text
    • http://muwodedera.epizy.com/azure_cli_cheat_sheet.pdfIn PDF document text
    • http://bikaduwixunu.epizy.com/disney_animation_books.pdfIn PDF document text
    • http://sibubixusa.epizy.com/3129829145.pdfIn PDF document text
    • http://bujuxuvumelijet.epizy.com/overview_forensic_investigation_report_into_steinhoff.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/small_size_reader_apk_download.pdfIn PDF document text
    • http://tuxodubikanirod.atwebpages.com/96357739489.pdfIn PDF document text
    • http://rikopob.epizy.com/rujajemojixosexeva.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 5288 bytes
SHA-256: bcd55291f635525a5739dcf0b71f2646408cafd047f322c60776e307147fdf37
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5012 bytes
SHA-256: 61eb4208bac880d716809306ffaf48097743bb343059bd5ef6ca5029a028c013
font_02_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11052 bytes
SHA-256: 17bc165715a1345c1925bfcbb471f53241306a3a806ccaf97f37ee16e038e5fa