Malicious PDF — malware analysis report

Static analysis result for SHA-256 812fa06b74c1a2f2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 20:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e946cf53a0f3b9814f118fa4d361ed46 SHA-1: 9041d1b7d126dbbec26f59c42c7696580874cb4d SHA-256: 812fa06b74c1a2f28c61e3317633f5a0a2efc0e70a3cf373ecc84f5b45f157ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=if+we+forgot+phone+password+how+to+unlock PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hpf6p66gt4nafkcn10ruqjm94c/12534228277.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/83600799505.pdfIn PDF document text
    • http://3sdent.com/upload/files/xoxoserozewokugabadifomup.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72830965424.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/terukosuvarujojudidebuk.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/vodaguwegovazetivor.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/72433072455.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/dalebeluki.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/81603294639.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/83859347984.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///bimoburakide.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/fizonegolidafoteb.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/gedewitebofazo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35e476699---rurigumilapozogedejil.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/18826039363.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/98592145937.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/bepomanamokasixan.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/84190710359.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/56687301772.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/13882386575.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/33694493662.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/bixiri.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/64906194826.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/favezagakez.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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 11036 bytes
SHA-256: 4c2e172383aff4328ae8635353e94c362af1a2c847f28fccdf497d5253ab1ccd
font_01_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16376 bytes
SHA-256: 73adb2d1f404730a172b494225c4d83d267aa812df8e59a98eecd78b6c336df5