Malicious PDF — malware analysis report

Static analysis result for SHA-256 db38250d51e2be91…

MALICIOUS

PDF

86.8 KB Created: 2021-04-03 13:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 723e8fdff169dce57deedfb2225d9d7d SHA-1: 99c75b0452a71801d841b84840f731c98df6d4e6 SHA-256: db38250d51e2be91a39d1bf32af16892e75f26ce3adf62c1a0bb137b77054c51
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 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=what+is+compare+and+contrast+definition PDF link annotation
    • http://itverys.space/87718607133vmba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_60401e329e5b6.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/bGyienx/galaxy_defense_cheat_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/gHiUtTv/heroes_of_myth_romance_guide.pdfIn PDF document text
    • http://alexsaf.ru/the_tcp_ip_internet_layer_performs_functions_at_which_layers_of_the_osi_modelj8nbs.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Cjjwhaj/memubujevoduterires.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fd39bff26e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_60677bdd46844.pdfIn PDF document text
    • http://meetsoda.pro/92895252340elim6.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/laporan_kasus_pneumonia_pada_anak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fcce42f3587b.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/hfibWvc/download_brasil_tuning_2-_3d_racing_mod_apk.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/delegatus_non_potest_delegare_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/ljggiMb/skateboard_tricks_names.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/hfhiigM/exception_handling_in_c_questions_and_answers.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/nobilelusos.pdfIn PDF document text
    • http://santand-es.com/vidmate_2014_apk_for_androido4b5v.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/hgchadh/71914933057.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/gifz3ig/mopodukolu.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/ogjhjje/lemuxuxukivuvibojob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603feae4873ad.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/bjt_differential_amplifier.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
    • https://uploads.strikinglycdn.com/files/04249cf1-2471-43bd-b9df-2a6266b2aeea/how_to_clean_keurig_mini_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d2d2ed-f713-45d6-84c9-73bb91368761/21470378852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb86e066-66d9-4b14-a064-9ba943e18610/19441443730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573a153d-f935-4a6a-b604-3e01e779ff1d/defiant_solar_motion_security_light_2100_lumens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171ef9e4-1ef2-4ebc-b85a-d72b4f2ca924/nqa_iso_9001_logo_vector.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_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 5164 bytes
SHA-256: 1b7e45f8fb04f58a5d85aad65b4f447b9a86143fc1fc216204ed49f26ef83481
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 15060 bytes
SHA-256: 46cb4d2ca5e3a3792732bc195211ac1d5a1935443ce49c0f73cff63077cd6f83
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2