Malicious PDF — malware analysis report

Static analysis result for SHA-256 c441b2a56e2bab2b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 17:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fc1206a626717b1661bae2f227c95ba SHA-1: 6b934545ee1447ca43f035d4eee5411f0c9a4295 SHA-256: c441b2a56e2bab2b3bd1b88327745fc328b7339096075cedd9c66e2f027ce5c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=enterprise+products+partners+careers PDF link annotation
    • https://gencshoworganizasyon.com/upload/ckfinder/files/12500189510.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///58511578833.pdfIn PDF document text
    • http://geodez.com/pliki/file/rajoguwirerufo.pdfIn PDF document text
    • http://drironcat.com/images/file/37235393877.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuperix.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/befoworelufulomomifo.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/33126084570.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109112345496403.pdfIn PDF document text
    • http://youil.org/userData/board/file/kavodegefujixanizaf.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xazap.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/jodujagipofel.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jeburedawe.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/tiden.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/muwiputipiz.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc54d46149---76436908822.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rivubujusija.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/73892625376.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hnbrb69d5ffn772b80c4aniku1/zalawuxutozifesage.pdfIn PDF document text
    • http://atek-ent.com/upload/file/43787023812.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109141911291192.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/64806580163.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/36259340145.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rilufilogus.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://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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 10544 bytes
SHA-256: 9b92d4b257c5875db241f98ed45829bf8c3c93ba04413a23f2f907c199561fed
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 17692 bytes
SHA-256: e3424b7b5512b77a4279f3acc215405cba5f8d0c510ac00854cd92bc2b09eaec
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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