Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ad067d54994c9c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 07:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 992ebb493fb38d48005fc815e409add6 SHA-1: ba50042d8f6346b1b77799c73310bd94853155a1 SHA-256: 08ad067d54994c9c7cc7e5dd71fd1916acf3e93903e8ed7d5942609ba798394f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one flagged as algorithmically generated, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iwanbim.com/userfiles/files/lugotajusoji.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024eadcab8---wadigojudug.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/98211313801.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/31866574305.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/xazisawubaxegoliviparaxo.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/68280124242.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/89272436388.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/togokodege.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/14338886808.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/13140015180.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/87880055401.pdfIn PDF document text
    • http://cpviettin.com/upload/files/50193678481.pdfIn PDF document text
    • http://montesantangelo.it/files/files/viforimebo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135181a1af1b---pazesudum.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/59963901262.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/55329680496.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/66301599948.pdfIn PDF document text
    • http://saktigroup.in/uploads/saguzefoligoterudelif.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/kerasaf.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/funabamiwujupubaloderi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=m3u8+mx+playerPDF 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_off0000be0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 10520 bytes
SHA-256: 86a4bca1ed59cfe13242e3c30afab49b626f2a6cbedfb050f4ae5281c3fe0b3c
font_01_sfnt_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 18772 bytes
SHA-256: 97ed85131c1503769170c633f537122bb0bfea324fee6bc46773aface2f2553b
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1