Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4de39b1132dbc…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51d4c73db736b3e30add6da618d00542 SHA-1: ab7992a3bd96f26b847c88dba96b0362c8427607 SHA-256: fdc4de39b1132dbc688ce66befbafd7de35ac9966ac776e6847bcf43b835894f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=ford+focus+powershift PDF link annotation
    • http://camberwelltaxi.com/survey/userfiles/files/66923932061.pdfIn PDF document text
    • http://pvvc.cz/files/felof.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/61746263302.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/fuxaxajifezofunuxaxusavi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/dababodirafo.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/sesil.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mibawewovalag.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/luxutuj.pdfIn PDF document text
    • http://prosquash.by/data/26179737399.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16152bb3f64817---xuvene.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/34608238564.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/9988110284.pdfIn PDF document text
    • http://industrialdevices.in/uploads/lamogujuzixa.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/lotelan.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/43274679120.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/xowoxopusowaravepajagi.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f560bb58b1c2c513487b0bf683385707/41084930370.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/18507872296.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_off0000accb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 10568 bytes
SHA-256: 81c4795af1415aff4ece963b1a1b29bd6a34034ef87371fe549b5f34e80697ae
font_02_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 15924 bytes
SHA-256: e38428879e6576bfdeaff293c28cb63eac161af0254a23c30aee45e896e00f25

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