Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d62936af4fb174…

MALICIOUS

PDF

92.7 KB Created: 2021-10-11 10:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 242916bcac180d27a591e3b37962bed4 SHA-1: 1cdea79b14e1a12b05462d2e10a6f9e51f1e2c6b SHA-256: f5d62936af4fb174935a5b5bfd66896c19658c1c4f6a1d7799d76c29f8a419ed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting and impersonates cloud document services to lure users. Numerous embedded URLs point to potentially malicious domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=pdf+annotation+onenote PDF link annotation
    • http://nutronicltd.com/userfiles/file/taxebediti.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/ravopunutulutikokife.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/lexobi.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xigowikok.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/katodamizimozid.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/javodosidugefev.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/dezunofazupijas.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/93205965025.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/mekilofopisomozasugegiru.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/14943850407.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/53180384601.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/voxetinarupovun.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/15842214794.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/vulapowo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/89982313625.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/mefalozuxusuxezapiru.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/83504304009.pdfIn PDF document text
    • https://maria-galland.ru/files/file/64565171530.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/99539623197.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/suligusomu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9360070992.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327dc1907c5---vedupi.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/jotikumosisa.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/sevevukujarodadag.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/75992116940.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/44045920928.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_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 19420 bytes
SHA-256: bbce9f523bedccc7c0f8a70697ee4aa4ed722ea83664b53f1822a2136672415b
font_02_sfnt_off00014e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9B 10032 bytes
SHA-256: 1f11676f536c1c4203dd4430730324f92ea6a8f1a7c7de0940b81ec93b6cf6b4