Malicious PDF — malware analysis report

Static analysis result for SHA-256 f519d7bd757f0d55…

MALICIOUS

PDF

71.1 KB Created: 2021-03-23 21:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5fdfce98916964ab06256e7a0e89b818 SHA-1: 73b7dc161c5faa990f93e3f2bc3fff3d8bc40f05 SHA-256: f519d7bd757f0d55243ea83dd2eb4408e7a8d90c183af7d67bcedeb845b720ff
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to 'jottigo.ru' and framed as a search result for a book. Heuristics indicate it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=clinical+chemistry+bishop+7th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446496/normal_60280ce61828e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fec07bb9c9af.pdfIn PDF document text
    • http://instacopyrightcenter.com/sensus_water_meter_partsm9ieu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fdb527120b5e.pdfIn PDF document text
    • http://videohost.space/76569708235mzqaj.pdfIn PDF document text
    • http://help-violation.com/lawakone8bxo6.pdfIn PDF document text
    • http://telgrm.site/how_are_ipads_used_in_the_classroomsz699.pdfIn PDF document text
    • http://haustova.com/roferejajafufodemobamoqvec.pdfIn PDF document text
    • http://christmas-gift.ru/oxford_dictionary_free_download_english_to_marathifoulx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fcedae7b1bd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5fca40f158fa1.pdfIn PDF document text
    • http://gratoraama.space/whats_my_5_love_languageshszri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_603d72900ec89.pdfIn PDF document text
    • http://nazhivy.net/cambiar_contrasea_gmail_desde_el_movil_androidq178i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ff89a8267e05.pdfIn PDF document text
    • http://helpverifedbadges.com/what_does_the_un_do_to_stop_human_trafficking7mtmt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8685a933-e4fd-4f2b-9218-c0a72d82bb72/bushnell_game_camera_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a332bfa1-426c-4764-aecd-ef36b89962b8/black_and_decker_1.7_mini_fridge_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9443200a-c14a-4c09-b3f0-625a5eceea3e/2012_maserati_granturismo_convertible_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7640b7-8e57-4cf2-a88f-ff5caa353cb7/what_are_the_health_and_safety_issues_in_the_workplace.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_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 5624 bytes
SHA-256: d5cca6604721cd413df6460a556198f45c50f3acc19054c2a1112f8b7ab5df6d
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10632 bytes
SHA-256: 03ab4accc512fdcec2f5f276fc1742a9913e8bef83b8e196ea198782daef926d

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