Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4d77fb7abaa22…

MALICIOUS

PDF

82.6 KB Created: 2021-03-05 20:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f36239d57ca13bcb95cfaddadc1722d4 SHA-1: dfb99c0e36f7b0f08c556be3e80e18ba9087c5f8 SHA-256: f3a4d77fb7abaa22611e997484fd15399d94f0a93dcc5945924e1b8a70502ce4
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing or social engineering attack, specifically a remote-support tool lure. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://golowaki.ru/aws?utm_term=best+wow+settings+for+fps PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/penik.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/YxGhbKt/maxivuxiwolorigulanodo.pdfIn PDF document text
    • https://cdn.sqhk.co/sadinuko/Pa5jjzd/82081341800.pdfIn PDF document text
    • https://pukejuzim.weebly.com/uploads/1/3/4/4/134457080/1529452.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/62564ec8e1cdea5.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/learn_to_write_arabic_calligraphy_omar_uddin_download.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/duvatomufupaduv_vezobikevukuzu_xuribi.pdfIn PDF document text
    • https://fopepusev.weebly.com/uploads/1/3/1/3/131383694/c2b7e.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/misab-fazinu.pdfIn PDF document text
    • https://nidoziba.weebly.com/uploads/1/3/0/8/130873853/xegutotolizuk.pdfIn PDF document text
    • http://itdiscounts.pro/mosobafuzusaletim8kezo.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/eggp180/getudedosarijitugim.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/75becc8.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/piluzi.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/automation_studio_6._0_64_bit200r4.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/4178894.pdfIn PDF document text
    • http://bachanalytics.com/logmein_sound_driver_uninstall_macxj7q3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/why_is_appearance_important_in_an_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/cisco_networking_academy_packet_tracer.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/molamez.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/rukozumugexiluki.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 4968 bytes
SHA-256: 4dd6e527b96329ef88dc4abed42e08b2a206ce84aa2f842d71b0c5a818497f3a
font_01_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 11204 bytes
SHA-256: 7e9e48306bc5c723c55405b0ed89b4683317cddbc8631681ea583e2d51b327d4

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