Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff7ac006943f79a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b80a067cdbea3f3f97ad39c6269e979 SHA-1: f328675f9aefc3699ddd44264b705312f4df1199 SHA-256: eff7ac006943f79a40ed54392404b0228e2bb4c17ed7ddac20417d1cbcf79d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://firmabudowlanawalczak.pl/web/uploads/files/gijarekagevibesufupe.pdf In PDF document text
    • https://socardan.com/userfiles/files/menizim.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xopoxepufovorubixorarid.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/tofexevi.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/16655191320.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/5758553106.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/3428373937.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e18954c834adc6f2f8fc400180ccef0e/tomepivumogoj.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/6199551007.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/46210000975.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/rubalodewugotokelepipoz.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/89376545501.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/91934567602.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jonoxelusomisovazupasejov.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/gopofagivukiv.pdfIn PDF document text
    • http://hainfelderteich.at/zekopepilate.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guranokedubojirugerasuni.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/89619043130.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/58936775029.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/22893922446.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/72441262952.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/33090088369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=unlimited+power+by+tony+robbins+pdf+freePDF 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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 15248 bytes
SHA-256: ef3f1a26812f95cfee4e26ad97cf7b65fb39201c4bc38a1231127a3ff2478241
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10844 bytes
SHA-256: fc7c74c0dbf4d2f92b38137f00964e3367e48d34628ade866a8c0fe8765c2e36
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1