Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac75b5a136f4635…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 20:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 798119c7475a827e94d7094767d55abc SHA-1: e9cc2bbadf7b9188405d5ba3c6c512e4be917ec3 SHA-256: 7ac75b5a136f4635656fc3bb0b0f529be76c5114dede734d1c3a72ae9a98c76a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. No scripts were extracted, but the presence of numerous external links suggests the primary intent is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=redmi+9c+root PDF link annotation
    • http://primeasset.hu/fileok/file/70947168697.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5bd3c1a4e35c9dd748f1af896d5badf5/pexigevulurip.pdfIn PDF document text
    • http://krupongs.com/images/file/84154094031.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/melizuvujiveje.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/9289711296.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jeraguduvuwujozadovi.pdfIn PDF document text
    • http://pi-consulting.ch/download/bevatisekoxomapa.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/30542813179.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161401a6edfe6f---jikazemugababemexomu.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/limodilajirav.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/57272569948.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/xokagikupubudodogukelir.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/79181992688.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/dowos.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/madilagikoluzotefidod.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tovakumojuratuji.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/pemuja.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/83226941946.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gesevoma.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/kukaxogudufoxasise.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/xitutifepexagep.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/lutilanux.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rupixalukukoluboj.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_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 16940 bytes
SHA-256: 40f2d6bece3edc091267aa19507de93bf82be63057180cc8fea45a70fa15855a
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10264 bytes
SHA-256: fdddb863e7218cab515e684508aebdc9a0ebdab7192a6c1631c97b39c063c330

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