Malicious PDF — malware analysis report

Static analysis result for SHA-256 d826fd5f5a3225dc…

MALICIOUS

PDF

71.9 KB Created: 2021-04-05 18:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68caa6dd38b7e143feafcfb61a7ef9e9 SHA-1: 48e31ac3b1c8e7479cc0984f8170a9cb8f888458 SHA-256: d826fd5f5a3225dcfffbc5a23e783b369a96f33ea7b28aa65fdde6678d04f1ac
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, with one prominent URL pointing to a suspicious domain, suggesting it's part of a phishing or malware distribution scheme. The presence of 'cmd.pdf' and related URLs in the document text, along with the ML_NYX_PDF_MALICIOUS heuristic, strongly suggests the document is designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mezovuduw.ru/wix?keyword=newton%2527s+third+law+of+motion+action+and+reaction+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456391/normal_60313698f1663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5fe9642147f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_6051ac75034f6.pdfIn PDF document text
    • http://jukekelexoseda.22web.org/civil_engineering_irrigation_mcq.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/54670940616.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/3651649383.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/kindle_model_d00901_reset_button.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/suwojixuwebi/jcqg2hh/10811661547.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/rzjajic/jump_rope_or_running_burns_more_calories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_603b15b8ca428.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/18625099459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixefixefasi.rf.gd/58938414993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d620f426-06af-477a-b9e7-712398da2e60/31259735636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e196e28a-30c4-4240-b7a2-eba4f9e1641f/buxowomesatokasefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e33c5c9-78d8-4b9a-b06b-baebb71df13d/roper_refrigerator_ice_maker_filter.pdfIn PDF document text
    • http://jokosen.atwebpages.com/class_9th_english_book_beehive_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb116e4-d29c-465e-a3bb-3443fbf44e2b/radio_shack_digital_multimeter_manual_22-820.pdfIn PDF document text
    • http://veramok.rf.gd/english_cursive_writing_practice_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa03f57-24f0-48ea-9232-1e9f8fc588ba/ps_vita_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e2d96d-c5dd-4a72-ad8f-d8b88eb47a80/xefaramigawenoveputotoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9e7953-ab8e-4e7a-bbc2-4992c2fd1df2/how_to_get_history_of_commands_in_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b0ef8c-bfef-4ffb-8f22-93e6fd3b6a05/serozuvepeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486a6bfe-fe62-43e1-887a-909902d962ea/free_download_twilight_full_movie_in_hindi.pdfIn PDF document text
    • http://terudej.rf.gd/list_of_windows_7_command_prompt_commands.pdfIn PDF document text
    • http://lafanibawonol.rf.gd/xajiliwonijopefusuvebaw.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://uploads.strikinglycdn.com/files/34b0ef8c-bfeIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 5420 bytes
SHA-256: ac61a0e47c67f32b19e9e0fae53ab070ae19d2cb8a2bdc2cdfa0e0147a574ce8
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10612 bytes
SHA-256: f219c8f2e0127d33196e6ef73530c4bef5480866015f4e5305b7587e0dd0a56e

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