Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60ea5654013c213…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 18:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 227dad1bbb82bb51abb6a052ead517dd SHA-1: bd5375168883865a87886ed278007cffe758c6b9 SHA-256: a60ea5654013c2132d1f20cafe7cfdb782021b2f0c969e506cdb551b64022bc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are likely disposable. The embedded URLs and the PDF's structure strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://studiotecnicodavico.eu/userfiles/files/zelulelupavad.pdf In PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/32340666845.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56535694e---wukazupudogivuw.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/kokufiminisovorewizomuwuv.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/22729296430.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/87726837599.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/35988133132.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/57794311180.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/15188654465.pdfIn PDF document text
    • https://quizai.com/uploads/files/nozijabojakerubago.pdfIn PDF document text
    • https://majubesar.net/contents/files/16402205959.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/14153102748.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/zozopu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b844harcjcb5k5ehiphe1hajr7/sabifezelaxipobiwaxumoden.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/mipojesim.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/46875709157.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/69455405161.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/ronugogugaguvaw.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/28454652777.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/44900789001.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/bunikukuwovozate.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/64006683197.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/30853709438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=que+es+marco+teorico+pdfPDF 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 17292 bytes
SHA-256: 58edf842d61756fb164ec87501e8ef2b0306ea5ad33b1a3b5eabb6a0ca9e5797
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10792 bytes
SHA-256: f7910b967aba760371e8a7046922f565df00d8322ef5b58f054277874494fd9d
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1