Malicious PDF — malware analysis report

Static analysis result for SHA-256 81024a06e786d188…

MALICIOUS

PDF

76.8 KB Created: 2021-04-01 15:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 70034160fd7e323403b6f08206b62bf9 SHA-1: 8e966f8a52fc3b86d7f4841d678ba37de34c8a79 SHA-256: 81024a06e786d1889189c6cdb1efe7c0cc17cbb9f46cf5d042b86ff2f85b57d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'calligraphy workbook for beginners pdf'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially malicious content.

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/123?utm_term=calligraphy+workbook+for+beginners+pdf PDF link annotation
    • http://registrat.space/mackie_1604-vlz3_manual1j1eq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5fdb1b7c57197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_603b75d215b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_601cc85223b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_602fba4b1ba85.pdfIn PDF document text
    • http://perevozka.ru/pride_and_prejudice_free_movie_download9vho5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_6007fcfa0d72b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fce70cb7f23a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5fda308c26c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_604aa6e89da76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_602ed7673404a.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/free_weekly_planner_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_03db02e69ef74d89b1d7e1274e912ec1.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_db4de45e2d644464aeee2213d072a7b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55d6be4-5a02-48b1-8595-34005d122fcf/what_is_the_dictionary_definition_of_agricultural_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de4e54f-d6b4-4529-a700-9896c497cadf/jibimureriziri.pdfIn PDF document text
    • http://kokujizodipe.rf.gd/washington_state_covid_rules_for_gatherings.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/what_is_a_primal_force_mean.pdfIn PDF document text
    • http://sefatefa.epizy.com/5769945629.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_0ed7311354bd46ba991e620dd2ad63a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/618cd1d2-04f9-49d9-ab5f-3c0480f02905/why_my_nextbook_wont_turn_on.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_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 5608 bytes
SHA-256: dacd62ae7290bac6cebac031839581371df8d67d4e76f6af38532d8807a649f9
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 11636 bytes
SHA-256: 2c72544cb5697502b3c50733f748672e7361267617e3eddbdf7c6d33d07aa2e6

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