Malicious PDF — malware analysis report

Static analysis result for SHA-256 d339514750ba407a…

MALICIOUS

PDF

105.1 KB Created: 2021-03-19 08:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3497d0a7340c7541c806b4b29d05b6ac SHA-1: 5065217e11283d7c3978d1d84c5084569140443a SHA-256: d339514750ba407a109be4fce1c24ee99d0888f7b332dc4e8dcf93e9064ccd17
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', indicating a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=thomas+paine+common+sense+worksheet+answers
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5fdef35ac55ee.pdf
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fda143698d9b.pdf
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5fca3748e6f6b.pdf
    • https://cdn-cms.f-static.net/uploads/4486763/normal_603aebb89cef6.pdf
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fe2bc02b5fa0.pdf
    • http://klyshsheff.xyz/cinema_4d_tutorials_freew8all.pdf
    • http://fijubigatusurov.scienceontheweb.net/21204361644.pdf
    • http://lozomaneje.getenjoyment.net/tezasifasaxipakim.pdf
    • http://1xbet-registrat.site/how_to_switch_on_dish_tv_set_top_box3x4x4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fowimifefezujo.myartsonline.com/wuxemijuve.pdf
    • https://s3.amazonaws.com/mipizaju/31232481721.pdf
    • http://vewawisu.onlinewebshop.net/www.perfect-english-grammar.com_present_simple_be_positive.pdf
    • https://uploads.strikinglycdn.com/files/c67b52e7-ed5e-4c50-b597-e0efcde537a3/beats_studio_1_vs_2_vs_3.pdf
    • https://uploads.strikinglycdn.com/files/67350cc3-08a4-4c76-9d1f-a267b85d1011/korg_microkorg_xl_37-key_synthesizer_vocoder.pdf
    • http://situwosase.myartsonline.com/shark_navigator_dlx_filter_nv71.pdf
    • https://uploads.strikinglycdn.com/files/3e17b707-ff48-4d34-8af6-2df3fb0ad182/65101880141.pdf
    • https://uploads.strikinglycdn.com/files/79cfef8e-6189-45cb-acd5-1f6ca44660bd/micrologix_1400_instruction_manual.pdf
    • https://s3.amazonaws.com/kiwopusafize/bomb_calorimeter_experiment_procedure.pdf
    • https://uploads.strikinglycdn.com/files/fbdba083-c586-4696-ac7d-6d75c11f4549/the_little_sas_book_6th_edition_free_download.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014991.bin
8d94336b8e4b2aa3ed1c3f25a65e5699f4fbaba75b33c3b5171053ec7205ba6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14991 5244 bytes
font_01_sfnt_off00015b46.bin
e4aca714062fcdf1759e3217d275b689ccb5ea5f094aa22629a4110703ada7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B46 11116 bytes
font_02_sfnt_off00018159.bin
c16373bf6dfbd7b9783ea8ea101a02cec618568b734ea643a6ef0820380ba589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18159 16176 bytes

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