Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c61711a32b7442…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 08:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c71eb0a86f701cd2071141d4ea979e0d SHA-1: 958b4af5af4001e80091a97804a21f29c1ee2a34 SHA-256: d4c61711a32b7442fb69f5ec47ba8508aa86b12f1b490b721de8df59aed3f915
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the overall structure suggest an attempt to lure users into clicking through to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=paul+david+at+last+a+life+pdf PDF link annotation
    • http://hyundaihungthinh.com/uploads/images/files/41953764083.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/84248604514.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/latudoramisubu.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/99121418912.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dopefetiwulot.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/36618168994.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/lovatizukomikofoda.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59069907593.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/85653494595.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/8334133217.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/gixutobinememivobe.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/masaropexugutilemapuja.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/22990548073.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/91976035730.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/24841274114.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/mumuzumifoxunurej.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b968d41a---firibatorunasazesagu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrdjpbru5kmq9a22gfv4rpj9p7/25629128289.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/gemukogagolole.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/nisiz.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/xurebafugut.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10336 bytes
SHA-256: 88b2df356627f4860348f89deb4badc1d8855230771348643764ed74c87b1666
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 18544 bytes
SHA-256: 22e5d08915fe0af8cc1934bfdf15f1c878133830ef3cb5f4970a05182cb54d0f

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