Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e2d3a5e41c82ad…

MALICIOUS

PDF

99.1 KB Created: 2021-04-21 11:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f79c46f36b2759c72eb6cf34a072191a SHA-1: 1c4d6bb2abd7428ba3c98fe369b1a6b5620c2ba2 SHA-256: f7e2d3a5e41c82ad401d6c1b5b9276b5579c745cd085b19d3edc94eb0cbc2640
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Autocad electrical 2017 tutorial pdf', indicating a phishing or scam attempt. The presence of multiple links and the 'link farm' heuristic point towards an effort to redirect users to 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/strik?utm_term=autocad+electrical+2017+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb36cf60686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5ffc5a69ee577.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/religions_of_the_world_hopfe.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_604648c211b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5fd36d016c066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fd3db4533b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_602df551313e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_60312815b4adf.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/renewable_energy_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_60639c8b7c273.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/27dbb6f5-3000-418c-b21d-ef5bdfa55f1e/a_handbook_for_classroom_instruction_that_works.pdfIn PDF document text
    • http://taxowojo.epizy.com/spring_framework_tutorial_video_free.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/1400432014.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/ski_doo_service_manual_2016.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/degodigiperurigowojasol.pdfIn PDF document text
    • http://sewobixisizazo.rf.gd/canning_process_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d0145b-60c7-434c-aa71-e04b0b3ad6cc/zexogefimulemuzinuluzibon.pdfIn PDF document text
    • http://dexifuv.epizy.com/49929756110.pdfIn PDF document text
    • http://bosirizowu.rf.gd/bing_search_ads_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d8c43f-02e6-4975-aac9-c5df2319d5b9/how_to_develop_a_brilliant_memory_week_by_week_review.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_off000143d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 5364 bytes
SHA-256: 74c620e7e07e6ab57fefc5a82725ad6db725b05b36272e53b71b53d06d1689a9
font_01_sfnt_off00015632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15632 12064 bytes
SHA-256: accee701e75f6d62591cb43e758bbfbed8f10f4f5602f032bd9ebb68b5dc52a3

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