Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf7edf5990cc69a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 20:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a686d165187dd0a8745d1205b11b6d18 SHA-1: fbc30957269d63ba9ffdb6151dccebd647db25a3 SHA-256: dcf7edf5990cc69a8a0a95e3bde381ec0dfd15630415b5e31419ed067b4ffbee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious document, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=free+photo+editing+app+for+android+phone PDF link annotation
    • http://cp-1.ru/userfiles/files/jigirovukadifak.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908063233.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/635341592.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/78308178532.pdfIn PDF document text
    • https://phuquiland.com/upload/files/tizopekimidobozamepap.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/tejajeviponojezo.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/juzuvijewotexuxogixo.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/72549032760.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2629170a42a29cd693db4b072fbb8212/tilekolilobuj.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/91957005888.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/7235436412.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/1038600851.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/85792641211.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/metuxima.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/29eu04i2u54t7ij6i7drp4sebd/motirotaduj.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/90616647751.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/ribunoburogugene.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/mosigetidevezigowipesi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/zejejov.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/73157654442.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/99273642769.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/pofikigilulikuvusisi.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109130628359094.pdfIn PDF document text
    • http://poliinc.com/upload/files/10493220263.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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17380 bytes
SHA-256: 7e2999ebe1adb77ab6fa496705e6a0896581d0dccc9134387b6202a46c5ad5dd
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 10540 bytes
SHA-256: f04408674ad5a86e9b60f6c1d5ce66e70768ffcf648dd3e5b118f155cf473d10