Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f554b29cd6166d2…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 02:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 83b7e6c5e34bc86eadf5ba23d6d3720a SHA-1: cd146652a3c3d8b5a8989a36a3948cc159465ad8 SHA-256: 9f554b29cd6166d28b7848343e80ecbc2a53e7bacd1712a0f9a384d94f924433
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=supersu+zip+file+free+download PDF link annotation
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/foxowipuguminokisut.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/gaxitoluxigewokebu.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631068090.pdfIn PDF document text
    • https://webrobogo.hu/kepek/71643667517.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/20283939013.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/63980244451.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c7eed14---55814729061.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31845766957.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/birovorabobon.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xagewuzejakidadeji.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/ganotetopivuxenisivek.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/99535174492.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908123749615205cmlnr.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vetelikamiken.pdfIn PDF document text
    • http://kotolantopeni.cz/file/poxakivibumovofa.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/91552049231.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/47439467471.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/xexiko.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/95477821602.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37641692426.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/61787931578.pdfIn PDF document text
    • http://newworldss.com/uploads/file/nuraxefaguwojaxut.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/xoluka.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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16180 bytes
SHA-256: 291dc57efae8974015dfd95654da49a0f4def715ef628bae00e0e433f322ed40
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10712 bytes
SHA-256: e2867d00137e0547c718781c2de7b9956152a0600f5e47d5650082d6564ecf8a