Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33a922711c6019f…

MALICIOUS

PDF

82.6 KB Created: 2021-03-30 15:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7a6f1411707cb0a81e29b621f3b4c662 SHA-1: cfdfc7110eb2920d08fe282324909fada487ea56 SHA-256: e33a922711c6019fe3538128a6bdc833925d9a7a43f9fee68c7573a52633b43c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The PDF structure and embedded content, despite being heavily obfuscated, are indicative of attempts to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=design+and+analysis+of+algorithms+pdf+notes PDF link annotation
    • http://reduslim-ufficiale.website/sat_chinese_sample_testtroo1.pdfIn PDF document text
    • http://trikolor.site/does_juicy_fruit_contain_gluten2yx1v.pdfIn PDF document text
    • http://the-job.ru/95895955694ykzv0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_600032d843887.pdfIn PDF document text
    • http://naturalik.fun/8178477147737efn.pdfIn PDF document text
    • http://site-shop.xyz/digital_signal_processing_using_matlab_and_waveletss3cm3.pdfIn PDF document text
    • http://1xbet-registr.site/33572214642x6ww6.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/dagusibunanaxafilifalo.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/75340546517.pdfIn PDF document text
    • http://ukrdomonis.xyz/nexus_mod_manager_dark_souls_2_scholar_of_the_first_sin804v4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5febb2b93bb81.pdfIn PDF document text
    • http://myfoxing.online/pufemexaebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5feb574aafd01.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/KghehiA/new_bengali_movie_villain_all_song.pdfIn PDF document text
    • http://kefets.xyz/nuromixurudikumiwodizaj357r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_5ff095eab75b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_60142fd560302.pdfIn PDF document text
    • http://hookup750.website/doxapolomewtgy4z.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/pozuruwoxewa-wopokuzof.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/1160075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/vocabulary_builder_activity_ancient_egypt_and_kush_a._content_vocabulary_answer_key.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/post_thyroidectomy_complications.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 5556 bytes
SHA-256: e92ba1df85020445a769e09c89e0f590d0e3dbfc6dd70beb15f4f1e109472b9f
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 11548 bytes
SHA-256: ac07a4ccea69ed7d2dec385b54ee2f3b7281e8f983752de27d5c8d9bb7320ab3