Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bae3caf26c4384…

MALICIOUS

PDF

76.2 KB Created: 2021-05-16 11:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67dc01f89bb17638950ba955194842d SHA-1: fc2fd8e25bea4c2c5f581d064b11ae26488e97c2 SHA-256: 48bae3caf26c43840274dcbfb17190153b36fa0fca5247f1ee8e445c29e5606b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were extracted, the embedded URLs point to a link farm strategy, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdn-cms.f-static.net/uploads/4375891/normal_6055bd59b73db.pdf
    • http://sujabupinoda.scienceontheweb.net/asme_b31._1_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5feed28a5b1cc.pdf
    • http://teplotronic.ru/255346500697o6v7.pdf
    • https://cdn-cms.f-static.net/uploads/4386591/normal_6042f20d6c392.pdf
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdf
    • http://pokezokebawi.mygamesonline.org/applications_of_open_source_software.pdf
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6041448a96b3a.pdf
    • http://jewlgems.com/roomba_960_vs_i3_vs_i7h6ezf.pdf
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd6db2ae86a8.pdf
    • http://antinomi.design/is_vicks_humidifier_goodxbhmg.pdf
    • https://static.s123-cdn-static.com/uploads/4408478/normal_5fcdadc536ec3.pdf
    • http://wejafopag.mypressonline.com/34397059465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=asp.net%20mvc%20version%20latest
    • https://uploads.strikinglycdn.com/files/2fceb923-bb08-41a1-a7f4-9821c6e5c5ec/vefumobumubaki.pdf
    • http://zutaturusix.myartsonline.com/bishop_eddie_long_funeral_program.pdf
    • http://solejow.myartsonline.com/convertir_un_archivo_a_word_editable_gratis.pdf
    • https://uploads.strikinglycdn.com/files/7a51a354-9fb5-498f-beb5-e7914ed25fee/2008_mercury_9.9_4_stroke_manual.pdf
    • http://fazobelo.onlinewebshop.net/the_assassination_of_jesse_james.pdf
    • https://uploads.strikinglycdn.com/files/0cbc53be-8b63-4838-bbb3-ffd3a19e2790/62645538036.pdf
    • http://wumafopid.onlinewebshop.net/malayala_manorama_news_paper_today.pdf
    • https://uploads.strikinglycdn.com/files/66a0eea2-5a49-426a-a08d-c8606dbca0a3/healthy_low_carb_vegan_dinner_recipes.pdf
    • http://jukasuxoseki.atwebpages.com/sonemurixirawidubize.pdf
    • http://fegoluvarelewum.myartsonline.com/blender_sculpting_tutorial_beginner_2.8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc0.bin
e10f5c7f86df86ac6b4a97d855f3e3b58dbebf75916eafb0106af697b7ef7899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 5160 bytes
font_01_sfnt_off0000fd45.bin
a393b34726f7c19e6c443ba2879b85847d02c6fe64d64177ed7170d198182105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 10756 bytes

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