Malicious PDF — malware analysis report

Static analysis result for SHA-256 d599091803689eb0…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 05:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20e508595b4786184c26943e0401ecc SHA-1: b77ea97470760b5c66ca3c3afebf5589ea5646e2 SHA-256: d599091803689eb0c6d66e0b9454123908f4a89fb8f7eb605483196c10ee0466
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'seumenha.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=causes+of+ischemic+stroke+pdf
    • https://cdn.sqhk.co/furugilenu/jcJjgYV/wepeserabif.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/lupusogif-pukilesuxovi.pdf
    • https://cdn.sqhk.co/xoradofexul/dgfjbhW/kivijedova.pdf
    • https://cdn.sqhk.co/guletema/VTjeoeI/slice_of_heaven_menu_cheddar.pdf
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/e6555.pdf
    • https://cdn.sqhk.co/jeforije/eVYjdih/playstation_4_walmart_mexico.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/afdb17e9-8702-4b17-b0e2-83020a4aa954/la_casa_de_bernarda_alba_resumen_por_actos.pdf
    • https://s3.amazonaws.com/nademopor/coastal_erosion_processes_worksheet.pdf
    • https://s3.amazonaws.com/kelukakeb/ask_the_dust_movie_watch_online_free.pdf
    • https://uploads.strikinglycdn.com/files/0cab5262-d573-4917-892e-961e6bf5e3c5/xujamuxola.pdf
    • https://uploads.strikinglycdn.com/files/da7438e5-a6fd-4a39-b152-58b1894f62d6/73975829409.pdf
    • https://s3.amazonaws.com/fasomusogapovi/lopefovofififukanuju.pdf
    • https://uploads.strikinglycdn.com/files/589dcb82-8748-47bd-8a22-c40e03e1800e/what_is_a_good_weight_loss_program.pdf
    • https://s3.amazonaws.com/wizidimawag/which_version_of_inkscape_should_i_download_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/6f34ecff-3612-4611-a42a-091d847ae1c3/what_is_a_wake_when_someone_dies.pdf
    • https://uploads.strikinglycdn.com/files/93448c7f-a722-441e-9052-2beccbcd81f2/wuxiwisudekobewigojejevu.pdf
    • https://s3.amazonaws.com/towutoginadivu/bovenupabaguj.pdf
    • https://s3.amazonaws.com/palikuvexake/target_single_sheets_sets.pdf
    • https://uploads.strikinglycdn.com/files/c9d85e27-678e-47e5-9248-aa2ceb172e8a/35388656456.pdf
    • https://s3.amazonaws.com/dotivaf/87260489496.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_off0000eaa3.bin
ac9ca14efdf227c06d3c11a3a033c3cef3929b90ebf5d923f0f9fe8e8ba423cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 5228 bytes
font_01_sfnt_off0000fc70.bin
7967712de83c4ddc50aee9fb885b44a9ddd561b88b429f56cb5853e4e5aeda04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10368 bytes
font_02_sfnt_off00011fe9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 4324 bytes

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