Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac199010aacfaffa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 816b8e26b5de8857b48db3992b1bb0d5 SHA-1: 85f0d4252f066e423deb73f1a9d10502ba302954 SHA-256: ac199010aacfaffa3adbd77477c5379e2ff4c01360d56c99ea884cb7f448e2bc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://belean.pl/userfiles/file/50016505826.pdf In PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/tabododexuninagaje.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/99152563988.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/85757697542.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/30710322949.pdfIn PDF document text
    • https://banghenails.com/upload/file/jerigopawegatovumapefiki.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/59614016081.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/pipomavive.pdfIn PDF document text
    • https://pepsima.biz/files/file/mopakefobisoliravap.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/96322880165.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/52650423218.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ralebewabujodomijoboluxa.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wukogus.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/60618090378.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/17143028620.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/begadilinijoxexobolas.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/pateguzibepiwobizaza.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/medijaludikebajaropos.pdfIn PDF document text
    • http://marketingnews.fr/images/file/21553907846.pdfIn PDF document text
    • https://clubon.top/uploads/files/davapexemoxasuna.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/diludajakagake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hangouts+apk+for+pcPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10568 bytes
SHA-256: 289c81b85e22f468e87aa53486e346d3ddaeadcac31923b18fa362fa0b50c89e
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 17012 bytes
SHA-256: df3034ec79fdf2ac5d0118e06ca2beddd50263142565bfed77c0ebe8e676e10e
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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