Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53676889586dcd1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 00:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 621b1e3d9d9d32bb6b9519bbad36919b SHA-1: 661847fa579f731c6a01bb125ee430e8e15ce0c3 SHA-256: a53676889586dcd12d1aa1f7225883a690d77c194857db06a1e811fb839c1739
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and heuristics point towards exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://balbok.net/admin/ckfinder/userfiles/files/75168796015.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/pomokunogib.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/15408398990.pdfIn PDF document text
    • http://wjcopy.com/upload/files/4058189389.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/deganaboxutikumiga.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vamerikitoxajamaxedodes.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/38193498257.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48111621003.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/79462658090.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/7678759624.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/27584892624.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xofiw.pdfIn PDF document text
    • http://manu-transport.com/documents/file/xaboxafapox.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/88865802139.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161486c1adfd71---14440894636.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/75550477705.pdfIn PDF document text
    • http://ahknchem.com/upload/files/fuzulefirado.pdfIn PDF document text
    • http://12shio5.com/contents/files/subinewuvo.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/60483770415.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3bae64e03---95856716221.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/97691357079.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/livoro.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/kalesomevuvimuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+house+that+jack+built+full+movie+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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 17780 bytes
SHA-256: 23131a6133c870b2f956be412eed9d1f256d46963773684e69f412823088d9e8
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 10988 bytes
SHA-256: 02b4472f0e7e756833c10b434b06ce44386ac0d9d1baababe9e01a3d5fdb3d81

Open this report in the interactive analyzer, or submit your own file for analysis.