Malicious PDF — malware analysis report

Static analysis result for SHA-256 98626ef415319992…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d450ad3d1b77f293ea34470fd6a5a83 SHA-1: 35cf402a20c22dbde37dfe3d349de90ec538f4d2 SHA-256: 98626ef415319992ebe6f1c341e810c691ae15065b7d7ee1fc35c4ed75b9bd7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous disposable hosting links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://geoplan.su/userfiles/file/13366282572.pdf In PDF document text
    • https://fishuntpesca.it/file/luzuw.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/44747724462.pdfIn PDF document text
    • http://www.polni.si/Images/files/pafoxugopowibidowala.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/juwoge.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/21456041630.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/32773240474.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f25bc618---68580899463.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/giranikikox.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/mibizovekizizipud.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/35032670000.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/tajavulukixajovexuregew.pdfIn PDF document text
    • http://kaies.net/upfiles/210913031823509561rmgikc.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/26360898381.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajojemububugafazomifim.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/zugabinidifabijajexebaxe.pdfIn PDF document text
    • http://telecycling.org/files/file/nunuw.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mizarujenuma.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/zozakofowib.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/96315702260.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f3d101cb3c873c6516fb214b731391b5/pokodafakuwuzo.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/megexivunokuratokarodim.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/96435480069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=flashdog+pro+apk+downloadPDF 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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 15828 bytes
SHA-256: ead96fc38abf20f163e51998c0b1b2ea0deb44e16aa25e1e87bc616118c2371f
font_01_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 10504 bytes
SHA-256: 706ff77a2b10d341e118a4deac2703e59c5dac113ced3ec79d1c47561fdea645
font_02_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1