Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf61e750e48a59a2…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 08:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6a13d34d4959492f05e425a6152db8 SHA-1: 135475562fc51873459c6b1e3a51b097509ff966 SHA-256: bf61e750e48a59a2ef3853660fc3bd23ca0964422498a72d86b09e216fb5059d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure point towards an attempt to exploit users via social engineering or by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/123?utm_term=mai+teri+chunariya+lehrayi+dj
    • http://gawaxoxirerefi.22web.org/baghban_full_movie_filmywap.pdf
    • http://sekujirimabasas.getenjoyment.net/how_do_you_write_a_tok_essay.pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_6045f6ff48622.pdf
    • https://cdn.sqhk.co/vonezositixi/qzmjdhj/64579823131.pdf
    • https://cdn-cms.f-static.net/uploads/4368488/normal_6044f4a16df7b.pdf
    • http://wotedogupowu.sportsontheweb.net/tisujakakivifup.pdf
    • http://xepelewatelaziv.getenjoyment.net/fusionner_deux_en_un_seul.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020f8a1dfd4d.pdf
    • https://cdn-cms.f-static.net/uploads/4428038/normal_6019ae4ba4a9c.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_6052847371503.pdf
    • https://cdn.sqhk.co/kuniremolu/jcAhijj/notepad_for_android_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600c994959c21.pdf
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fe2f5ca7e67f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://talavapupaniv.rf.gd/urdu_to_english_paragraph_translation_exercises.pdf
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_549b31c2348d47b0947e5632ee9519ca.pdf?index=true
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_9c74a98c2d6441cf85361e77bf0d7eea.pdf?index=true
    • http://rokopuma.epizy.com/widolipasuwedofepil.pdf
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_5c6659d2a0c24922a599f801d255bc84.pdf?index=true
    • http://fobadosox.epizy.com/rest_web_services_java_tutorial_with_examples.pdf
    • http://zosuvupetod.epizy.com/7537814455.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_91402d62878e431b995a4bd4713c6bee.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_bfc4fbf37930415784737c6b0c3e8da8.pdf?index=true
    • http://zijiwaras.onlinewebshop.net/25023498919.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c6.bin
93c7444ff821844b7be83ae8048ddb1f8c738266e34076256b39aa1e01b4c13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5032 bytes
font_01_sfnt_off000102eb.bin
1b46d5bc4fdbf0d6fe8c63cd43ee594182eadc69f4e4c2f28049411ad73c8202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 1792 bytes
font_02_sfnt_off00010bc4.bin
3abe8f871b2b9d857bd69f707a96c04965dbf1ecf8b9a70ffc66f30426356b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10372 bytes

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