Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab32b0ea459eab2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 17:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6aaa63ca236084ffe7612a2192b6a9d SHA-1: 608b911eb57bc5869e19f91334f162209dff09ec SHA-256: 4ab32b0ea459eab22e7b3299966a6b348b12cfcb04db218c7691b309de1bbde9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic indicate an intent to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://krisoc.ru/uplcv?utm_term=how+to+save+a+screenshot+as+pdf PDF link annotation
    • http://studiotecnicoforace.eu/userfiles/files/modudetiriravoruzugedajar.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/28246120035.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/vofamuserigemipez.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nasaxuxegoj.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/20559877495.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1dc0977---pisik.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/75066438346.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/joxibomevixadita.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/muxizokurusumudowodom.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/metekuvegepozu.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/74005700092.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/dekeserusov.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/febokupokojelupupogepe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dedf67f9c6c297db1468cebdd9ff75e1/tujexitekusede.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/57264447756.pdfIn PDF document text
    • http://maxbrio.kr/files/files/3510976888.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/3447497041.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210927_145418.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/takozitukerekezafuwomod.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/3052088938.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/46417629773.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/gokixovevedafekitu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/nugifezozezosagavonifub.pdfIn PDF document text
    • http://jump360.co/upload/files/20210918093001.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/lugopoluvaruxipiroxazaf.pdfIn PDF document text
    • https://onlinendttraining.net/files/fipoxijorimezuwar.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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 10720 bytes
SHA-256: 071ca41b462c703ce266670253bac5b3c08d2fee19fb4cc09fa80dcc416eb918
font_02_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 14232 bytes
SHA-256: d04c115b89594ae6e44116888d3814931f8473a8dd7897bd7b6111346e5daa43