Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce14e11dd10b3c8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 23:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbcc40d4c5fd315980a1f27f2ef58a83 SHA-1: 646796778c754f11728f15fc9918fcd8a2861fc5 SHA-256: 2ce14e11dd10b3c8c4e4947d46ba8638e6610d8b3b959291a94b99fd1ebd0004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://studioriboldi.eu/userfiles/files/70818753811.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a4ea46soj94a3e9ovbn5m9o6n/13610534258.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109071216001787.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/34014905160.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/15391878160.pdfIn PDF document text
    • http://maksimetall.ru/files/44066709608.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bikusu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f58def---xulefufotusafa.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/31840136215.pdfIn PDF document text
    • http://mp-journal.com/media/file/babizaviwuvowovet.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/68815481013.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zerugemeton.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/lexuxarodoselavaza.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/raxosidatiruxuvun.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/45476428852.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/55703324656.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/96219595386.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gajidifaxabibesonibedok.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/vezesixitozumitujuxasivu.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-4/20210904045332845975.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nedusidedalidemimip.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/sojonuxopagefeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+app+assets+folderPDF 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_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 17664 bytes
SHA-256: 4c872ffa0455d4662d89babbe878afec3d5de95366aec202b446c4305795e569
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 10472 bytes
SHA-256: 0dc502445034c5272256e73277cb14b7cd10e44d4080fdf5fa743010e8945e6d

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