Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57d85774b57ad98…

MALICIOUS

PDF

107.0 KB Created: 2021-06-10 17:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ba226a9fa29f7c74d15331ff5932808 SHA-1: afdcc4bf6572a616ef42c330a738eedde13a7d98 SHA-256: c57d85774b57ad9886a3771669b82004ddd2fce8733d439c545e4919eb77f97e
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 0.9994

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://drafthe.ru/pbw?utm_term=think+and+grow+rich+chapter+11+summary PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4385887/normal_60b59191a9714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6032b88e68e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_5fd6484db6181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/f/duzilizodudetoju.pdfIn PDF document text
    • http://momoruxoxim.pbworks.com/w/file/fetch/144747177/doraemon_nobita_and_the_birth_of_japan_2020_full_movie_in_hindi.pdfIn PDF document text
    • http://betifabito.pbworks.com/f/afara_e_frig_mp3_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1e7b0c-a576-4dbe-b466-3184a54f96ff/tipitevurerojurepiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210a054b-4df7-4028-8dbd-b74b51c6e4d2/53519389745.pdfIn PDF document text
    • http://zanopadik.pbworks.com/f/bepivakidowunirepex.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/kinemaster_pro_4.11.16_mod_apk_free_download.pdfIn PDF document text
    • http://muzurinugaw.pbworks.com/f/fufabutuzijupoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c7b108-88ae-4a06-a568-bc31fdf32535/medatagutuxuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30654e8f-b770-4023-8bc8-b529eaf88b3a/kagakutitiwenowel.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144464691/online_shopping_project_ppt_free_download.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/formula_del_centroide_de_triangulo_rectangulo.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/4328499620.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144787572/kajitosisex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40d3292-0e8e-41a7-923e-94d02a2c8517/50563084032.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144725112/vixodonominewajowi.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144587622/como_descargar_minecraft_pe_ultima_version_sin_licencia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcf96c0-0365-4e8c-9cf8-8b63df5e56a1/milo_manara_illustrations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0940ddf4-ce0a-4c63-a275-e1918adc37c4/stocks_to_invest_in_now_motley_fool.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/w/file/fetch/144520827/12470173083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed496c1-c486-44b8-a756-e170f8033b73/gujubasakofitekido.pdfIn PDF document text
    • http://jinotofatum.pbworks.com/w/file/fetch/144950898/macbeth_3_witches_names.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16594 5712 bytes
SHA-256: ce0dd272a7f83f16eae090f59f50179deb89f98a9e75ff621c131a41f8a6a1cc
font_01_sfnt_off00017907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17907 10876 bytes
SHA-256: 6c19ba6fe9616fd566afdb5642c248212429773fc328a2f73b5fb1b4b66c9868