Malicious PDF — malware analysis report

Static analysis result for SHA-256 3412db851a08f9a1…

MALICIOUS

PDF

99.5 KB Created: 2021-04-26 16:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb3780d0a57cb8d47eb1878b011a9c2a SHA-1: 751de10cf9185e9e8686e648cd23efe8dc31ef97 SHA-256: 3412db851a08f9a14330192e25e13bbd4b977c64bda23978ba403f027fc05379
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to interview preparation. The presence of external URIs and the overall structure suggest this PDF is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lozipotod.ru/strik?utm_term=how+to+prepare+for+care+assistant+interview PDF link annotation
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ahcwhfg/pimelukodoz.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/HhRhgPy/muguvamu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwasowoset/ljezhci/gujegunegig.pdfIn PDF document text
    • https://cdn.sqhk.co/luveruzosu/jdx7cz3/windows_keyboard_and_swapped.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/fipovav.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/stcw_2020_manila_amendments_free_download.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/siwakuwamaxexubar.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/similarities_and_differences_between_arteries_veins_and_capillaries.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/is_the_stock_market_open_today_july_3.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/introduction_functional_analysis_with_applications.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/diwivo.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/tulawewoto.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/jidodijagataxolaxivoniz.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/29kZohb/oscar_grant_case_prosecuting_attorney.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/7mm_rem_mag_load_data_h1000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xijewixevav.onlinewebshop.net/66891801536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329cba87-4253-4e97-9396-9199a7b5d6c2/xigopijilajijat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498c18aa-c6ca-499b-adec-7ca596e69077/have_yourself_a_merry_little_christmas_chords_sheet_music.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/how_to_put_a_heavy_duty_stapler_back_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e6bd27-0277-449d-b34e-0c313caae742/kiwesekipakaravozo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 4880 bytes
SHA-256: 54311d10c7061eefb009b09383a8a0fde67c6dcdbf203d1bc08a879094d84fe1
font_01_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 2272 bytes
SHA-256: 8627510ad825a5932f28f37a2916e4ee2de3152b3515f434046631ed4fd11e10
font_02_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 11500 bytes
SHA-256: 0357d94afe3a0f9c8e80098e79401d641573706104c1219f46f754ad0a99f868
font_03_sfnt_off00015d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D29 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_04_sfnt_off00017191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17191 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3