Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f2ba91a8f2f872…

MALICIOUS

PDF

86.0 KB Created: 2021-03-13 14:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4682e47cc2b4fc55d30730b538d2199b SHA-1: d32a78abcc872061cee7389202971d9d02afaca3 SHA-256: 12f2ba91a8f2f872572b76468eacffaed10e455d6950ff674fc7b8373ca3af76
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly legitimate ones. The primary malicious URL identified is https://maypoin.ru/award?keyword=cell+biology+pdf+notes, which is likely used to serve a phishing page or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=cell+biology+pdf+notes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404529/normal_5feb9c401e4b3.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/5ihsjiT/43249079789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_60238a4a24e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_6046dc4e7c7df.pdfIn PDF document text
    • https://cdn.sqhk.co/numexerab/iijFeSg/jidudabidamemimedipemub.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/hblszif/business_relationship_manager_resume_example.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/bzgffid/cd_zezo_dos_teclados_as_melhores.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/ajgCjc7/45821650030.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/houghton_mifflin_social_studies_grade_3_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_6014e15bc1f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/jjCghhj/kingturn_apk_mod.pdfIn PDF document text
    • http://gapeveta.iblogger.org/canon_mp250_cartridge_refill.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/stealth_fusion_wireless_camera_review.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/tcp_ip_guide_table_of_contents.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/how_to_change_the_battery_in_my_g_shock_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/8zhgho3/96881662906.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://s3.amazonaws.com/vufupu/los_personajes_principales_el_coronel_no_tiene_quien_le_escriba.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/podokepokunanub.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/honda_eu2200i_generator_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/are_hearing_aid_domes_made_of_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/pexiluj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 1956 bytes
SHA-256: 5cc08442638e7a583ef49f790b342299227daca648f802b3a4530b659ff74d01
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 4956 bytes
SHA-256: cf81519a2de09c599b21c4bb6e3b8b44841e6951f356a65966ee6bee3e036c65
font_02_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 11640 bytes
SHA-256: 92e4d94f8fe37dc31c1306dfb6ef049cab18118f2841f215c8ecd519eab205c0
font_03_sfnt_off00013c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C43 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f