Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73b92fc9a766a5d…

MALICIOUS

PDF

101.2 KB Created: 2021-09-22 09:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7292842efcd833a2863bf60bf10c8c79 SHA-1: 76beb73b200a07d957ee5afde324a28f6a081da4 SHA-256: d73b92fc9a766a5d72aa00e2406c730a5760867a6afcf2e91c64a5ac45a4e8be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The presence of embedded URLs and the overall structure point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=three+kingdoms+tactics+hack PDF link annotation
    • http://kraemer-duennebacke.de/files/file/45872617510.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/sakexupajiwuvavumigivi.pdfIn PDF document text
    • http://telecycling.info/files/file/73818428185.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/susapesized.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muguripem.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/40386881079.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/niwawofibafabemowoza.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tibivas.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/92989728106.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/goguzi.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/11881602665.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/61244842562.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/1033464783.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/gifuwipevaparixex.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/fitisibovirugegef.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tovosumixujewijelo.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/puwelekedekujuvadojetelon.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/sodasamekedibepuwabis.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/wizazerodijeginisek.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a47d1ebc77---suzegaxamizifa.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/muxatit.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wurulugotamewo.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/82420891403.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/wejegegavelaruna.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/79394141984.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_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 21176 bytes
SHA-256: ba3bbd3afed2c3c649aeec7e83d42c44e509e61b9a089532395c19933606ed39
font_01_sfnt_off00015630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E47 10824 bytes
SHA-256: 17e68df749668348033fc208b0e54f838ef031cb66c4af838d5d3ce4f05e247a

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