Malicious PDF — malware analysis report

Static analysis result for SHA-256 53245f908d66a3b9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6749b24217d4477d8569fba08a081347 SHA-1: 58443e67f901f2234f6ba970d64b90472a2c87ef SHA-256: 53245f908d66a3b9ccde162d6e4f1719b10c888141bffa22e70c2408d7c6a160
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are disguised as download links for software, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=pdf+to+jpg+converter+software+free+download+for+windows+8.1 PDF link annotation
    • http://3colorjazz.com/fckeditor/userfiles/image/62653711601.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/narexefoxamivesujuve.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/maritabad.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109080547564117844n9h4zbtw3ca.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jawokevimipisolegerasipif.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/datusaridubukovuninuz.pdfIn PDF document text
    • https://teamcode.net/upload/files/fuzabakakavoterav.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109080849537950.pdfIn PDF document text
    • http://mosjob.ru/images/file/43570043354.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xarafujola.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d240711d---21988626378.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/78692039308.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/99364593321.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/11465919859.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/bimafugamunonumafo.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/koganunevodenopogesibosa.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/subinakidol.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///govam.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/netewoj.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/29009041077.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/46613134581.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/dosugukaburazaponuseju.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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 11404 bytes
SHA-256: 85479f188cef2eab383b12077a2ac5cb3aa2997c123591d22ddb2d7533f062e4
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16580 bytes
SHA-256: 28938b06be4a9195e72681029788ea5a68aa0086d9b16e882e7f88fee780a3d0
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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