Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fa25b56a78729f…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 11:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f3a0f44f6e4f0682bd5f8be7dcd42011 SHA-1: 5f49279d10c68b9421229b0b9bc825e05b3b22af SHA-256: 90fa25b56a78729f9fc4723d3b76c26bef39fb969ef20ea97635ca76435e9fdc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The embedded URLs and the document's structure suggest it functions as a link farm, directing users to potentially malicious websites. The primary URL, 'https://jacksth.ru/wix?keyword=simcity+buildit+cheats+no+survey', is presented as a lure for game cheats, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=simcity+buildit+cheats+no+survey PDF link annotation
    • http://sezejawi.mypressonline.com/rivomotinozarakodexax.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/EPhihaO/among_us_how_to_play_on_mac.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/zenajepirijatakusasixob.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/228475719.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/inductive_and_deductive_teaching_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/BXLjhhi/17976102900.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/melegipejuso.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/82026580550.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/kosevaloreza.pdfIn PDF document text
    • http://tehnotop.store/cisco_ironport_email_security_admin_guide053qc.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/ninjutsu_techniques_free_download.pdfIn PDF document text
    • http://getallcreditscores.info/ranifovaeyw4x.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/english_grammar_quiz.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/the_dark_tower_series_order_movies.pdfIn PDF document text
    • http://biolinkus.me/genif2kfrr.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/cambridge_advanced_english_teacher_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/hiTggHF/stickman_free_fire_survival_battleground.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/9vjjid9/inside_the_box_movie_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_831e46642c5b4a8c8e537b7dd73d8634.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_c419e13c36b44943a44736b25d9e6543.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_170c72844c054cd2a2372baffff2b4ce.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5468 bytes
SHA-256: dbe7390ab0fcfe8ba0e7fa5db6d9b433b3162f994fc36c3977a19acf1b58c44f
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 10992 bytes
SHA-256: 56a27516158240e79c3312fb23705bb3221b1ced84e21a838657ee06c16eb9e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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