Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3486d37ca748d66…

MALICIOUS

PDF

84.6 KB Created: 2021-04-17 20:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c787415f4b05bc9b90e1d1ffa0c48c65 SHA-1: 594827fb023bb7e2f3ca008c544fb905063e9f42 SHA-256: c3486d37ca748d669bd17d46ffe493c8913302fd88e4da6bee703bd82e42a4df
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 0.9995

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://crophysi.ru/strik?utm_term=what+does+woomy+mean+urban PDF link annotation
    • http://mabay.fun/different_types_of_poem_genresnc2f3.pdfIn PDF document text
    • http://alsamcctv.com/75343309100yujlk.pdfIn PDF document text
    • http://xefofefejal.iblogger.org/measuring_bullwhip_effect.pdfIn PDF document text
    • http://bawikivogo.22web.org/amasijos_colombianos.pdfIn PDF document text
    • http://sisowim.iblogger.org/rheumatoid_arthritis_diet_foods_to_avoid.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/sewage_treatment_steps.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/tratamiento_psicologico_para_el_alzheimer.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/modals_of_future_possibility_exercises.pdfIn PDF document text
    • http://xikapajami.mypressonline.com/analytical_geometry_grade_10_questions_and_answers.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/aprendizaje_significativo_en_matematicas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/nifekeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0a00de-a5fb-42b4-994d-76c27ad4c9e8/kikunadezozekunoguguken.pdfIn PDF document text
    • http://xisajegaxije.epizy.com/how_to_get_free_music_on_itunes_without_downloading_anything.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/tenacious_d_tribute_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790d67f4-06ef-4d5b-9870-33394ef4632b/small_engine_repair_classes_michigan.pdfIn PDF document text
    • http://fijoxim.epizy.com/bunco_score_sheets_us_them.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/aditya_hridaya_stotra_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a8da98-373c-476e-954b-e2ac2b7ba18e/fetosobibarenabolibimasi.pdfIn PDF document text
    • http://jiwabebiweruri.epizy.com/ckd_pneumatic_cylinder_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f3cef3-d3b3-41dc-a9ca-f4dde2f9b2f7/pobofowilumavakur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341dcc62-caa8-4fe6-bc31-f8ec74cd1bca/respironics_simplygo_portable_oxygen_concentrator_manual.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_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 3184 bytes
SHA-256: 5b7d9f601403bef1f13ae7cc9fadb87c1d950b749d95d1a327f085b68c586eaa
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 5380 bytes
SHA-256: 8f4072d3e2785dc51d4bbbd48a886cf1827a7182ef5665d5eb994b710304800a
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 12880 bytes
SHA-256: c67d621e4ef2625b455d23289da4384a0047f233d3d0dd9977537c9a2777160f