Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbff6b84dc9af5f2…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 08:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91cf03b11b25d9896d07d5efc0abf66 SHA-1: 94c8b42a8b55d4898ecf76ed5e21145ed857aeb2 SHA-256: fbff6b84dc9af5f2fe5de4d7decb5d9eb8d2b63efbcac239c23bd28a5fbf983e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one external URI `https://jumiwimov.ru/strik?utm_term=what+strength+resistance+band+for+pull+ups` which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+strength+resistance+band+for+pull+ups
    • http://maddot.space/the_dialectical_behavior_therapy_skills_workbook_by_matthew_mckaygy6tu.pdf
    • http://pirewarekow.mywebcommunity.org/sopigupebos.pdf
    • http://banikomapi.22web.org/13992687371.pdf
    • http://world-wild-shop.com/pogokodedidazatimojora4s06b.pdf
    • http://ehaberdevlet.com/what_is_the_delirium_series_aboutxyujd.pdf
    • http://fallofelin.online/100_cotton_sheets_vs_cotton_polyester9p20o.pdf
    • http://juwaniwabi.medianewsonline.com/english_to_marathi_alphabet.pdf
    • http://draiwenstore.online/xozevoposalumijevu5bs2t.pdf
    • http://vobajujabu.mywebcommunity.org/wakomuluxituxuwojoravad.pdf
    • http://lomigakorak.getenjoyment.net/night_circus_book_themes.pdf
    • http://dressnbuy.com/vidoxovulawaviravfa2c3.pdf
    • http://rineset.xyz/640528650330c8g3.pdf
    • http://gatorama.site/kitchenaid_gas_stove_with_double_ovenu3v1t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tifilow.onlinewebshop.net/crnica_de_una_muerte_anunciada_captulo_1.pdf
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_9599e1b9cd5a4e9fa1fe888f7a260c3a.pdf?index=true
    • http://wijinap.rf.gd/3d_video_software_for_pc_free.pdf
    • http://nopugorib.onlinewebshop.net/kivuwel.pdf
    • http://jokubamobivavum.onlinewebshop.net/buffer_solutions_problems_and_solutions.pdf
    • http://mepulufe.epizy.com/70230300118.pdf
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_c7a75c57504941b0877ea66fb6baf94c.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_ab41f409b55149a6a797f3872ced328b.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_85b080ec75064eb5bb337493b5011ace.pdf?index=true
    • 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_off0000ea21.bin
0c3a4cda5ce57555b8dba19642111c206055d575159c9583fd693f75be6b450e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5568 bytes
font_01_sfnt_off0000fd14.bin
13339fc5d6ce6621be4242be36b4979e7d44955b1256d0396ed44ffe38a0b514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 10708 bytes

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