Malicious PDF — malware analysis report

Static analysis result for SHA-256 e944991d56a86b4c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 12:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86e783250126fea67ab0bddb0550f4ae SHA-1: 7610827f208fb9a75622c8776f5a1a81f689d46d SHA-256: e944991d56a86b4c4754f7f1062fdb227223beada8b8dbbec85a05bd15385ab1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=fantasy+craft+pdf PDF link annotation
    • http://saovietgroup.com/upload/FCK/file/wuzudijubiwune.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/15188560325.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tabalofux.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rojatewofodivaruj.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/774426897.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/30172497242.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/34039433554.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/29075799717.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/solirane.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/giwabusumuta.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/pomalafafufirigizef.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a48d7806c---89077768939.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/18038555911.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/73903460062.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gugudimigokogedejudidana.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/32813789486.pdfIn PDF document text
    • https://sim2007.com/files/54317098204.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/35407995537.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/4682494003.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/45210701182.pdfIn PDF document text
    • http://muszempilla.com/files/file/61008742633.pdfIn PDF document text
    • http://mcutech.net/files/mamejugiwimo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/bowinikedazojozidenuvimi.pdfIn PDF document text
    • https://pixel.bg/img/file/62413976810.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wuxaralidonoxevusafe.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 18680 bytes
SHA-256: b06237be36045aadbd680e5dd935a4291fc0e0eed8222a4a3760236d157ed1df
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 10312 bytes
SHA-256: 9f5a28ae8f14ddd9ccdac353e9abd4b1d64e2053b7a4c13f449565d84ba83454

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