Malicious PDF — malware analysis report

Static analysis result for SHA-256 a397a23a578cd06f…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 08:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d56c00eac5cf4c5655a21de1c37fa863 SHA-1: 18f4d414e33c4ce2cd41cda0eb826d0d2db96b0a SHA-256: a397a23a578cd06f2c93a7d91aa3e357439a2809fc853ae5d483c3e4f44201fc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/123?utm_term=fireflies+piano+sheet+music+free+with+lyrics PDF link annotation
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/vivilelet.pdfIn PDF document text
    • http://inscarusa.info/kufifosakixopojenulumirjsgw.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/6211001.pdfIn PDF document text
    • https://fodakapi.weebly.com/uploads/1/3/1/6/131637942/dezolaremegilimoduw.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/79194903577pj6r4.pdfIn PDF document text
    • http://sodahub.pro/pijojiwadiubmrb.pdfIn PDF document text
    • http://my-favshopd.online/how_many_sweet_potatoes_is_3_poundshpnry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe589cc7fd61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb7c63d9a35.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/tijijado_movuvetusu_jegufavavesug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6032a2e2461b7.pdfIn PDF document text
    • http://twoup-viktoria.online/33562323476r61xb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_60493619358f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60209ca7d6eb3.pdfIn PDF document text
    • http://verifybadgehelp.com/ugly_duckling_book_onlinegsboq.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/sagew_fimemabaguvazim_widukukurusu_vimuzutegin.pdfIn PDF document text
    • http://psyhologrzn.ru/how_to_make_a_cookie_monster_bean_bag_toss8qtoc.pdfIn PDF document text
    • http://leadtop.co/metabolismo_de_carbohidratos_resumenkwepc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/oh_baby_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/sugaratufodagagotol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e850f87a-3cad-43db-a651-5d5b25c53293/mogetonasulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06739f03-0c08-4260-b3e8-7204ed4caf4c/pobamonelizetobex.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/verobaxisufepofenokipe.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/pawan_singh_bhojpuri_song_2019.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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 4164 bytes
SHA-256: d415ac27250f46100b5aa8709051939850b5563feada49f329fc0070f8adaf51
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 5404 bytes
SHA-256: b56d863a27fa87c5decc8b29ff9b0053dcbcb2eeadbe26f9de3eee2b3ee16ede
font_02_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 12704 bytes
SHA-256: 47ddf76d0ecc102452a75e687693669ca57ac729b6e42bf5314ca24b620dee61