Malicious PDF — malware analysis report

Static analysis result for SHA-256 f188c77a5a95b5e9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-25 04:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a360b82c5105b5467be8728da490dd21 SHA-1: c10d60c37805dc518bcd10fb927932b90f75f182 SHA-256: f188c77a5a95b5e91758932938409f0a73138edccc78feb49c1a288879e3dbb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The PDF structure and the presence of external links are consistent with spearphishing attachments used to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://oniceh.ru/uplcv?utm_term=chrome+dark+background+android PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/77541748749.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/64471675583.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/1390451039.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50434828676.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/gikoligukomipolelizopopu.pdfIn PDF document text
    • http://synfarm.com/upload/files/sivitexuketazuxuna.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/kujotazoko.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/32941945369.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/54422033397.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/zuresaxaxoligawi.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/nugexosuronowup.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pijumivel.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/52756185508.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210911160904834708gll5k.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9152b34e---14069266507.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d4vjeva1dr43f6tbvrsji6gbql/gamojurawevunamagila.pdfIn PDF document text
    • http://tion.hu/upload/file/xebikumujaxuzad.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/49902039836.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/tawijukekezemub.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbac1e134f---38062212011.pdfIn PDF document text
    • https://km2804.com/ckupload/files/59589659944.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/39876743535.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/godetilizavorebaxom.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/wubixikajisukexota.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/mepewi.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/89577457441.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_off0000bcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBE 10868 bytes
SHA-256: 0de1a5b6c6d4d37160b186ac124bb1cd067ede23855c568ef7fef0f7eec046e6
font_01_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 17560 bytes
SHA-256: ce7aedb1fe7f1887ae8eef915d9d7bc6740a498a18229868c7bdba77f005d738