Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f063c62a3ccbae…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 08:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe4fb8e71ac21a2b4fbc13e3ea77062c SHA-1: e74944de6f8807feda64e46e09c8090485877776 SHA-256: d2f063c62a3ccbaecffb3424d0cd5fef66ff000e76758ae165e8f6edbce3e42d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous links on low-reputation domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=icse+class+7+maths+book+pdf+free+download PDF link annotation
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/bijapuvafo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/supivetegoratapi.pdfIn PDF document text
    • https://lasanisports.com/files/50614017908.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/14414334692.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0fd9e0872---64405594276.pdfIn PDF document text
    • http://patroha.hu/file/xojaxodivaxapeguwova.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/74654768721.pdfIn PDF document text
    • http://dejede.com/userfiles/file/39727853203.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zowemogurilefir.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/jebeb.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902063811.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/80375975311.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/towuvofo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/lidomavarimamesivup.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/velime.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/89143461932.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109091925186680.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/77822828870.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/sefazivigatizidebube.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e355c8bfbb---zikiwifaxixewo.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210918192608.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/74306352481.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/sezutorixijiwaboxog.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/lovefimasumufivelare.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/sazadiledokizaxifekej.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 17388 bytes
SHA-256: 219a9702173f4209d4a794e503303c678a6245f108b4cc5cdf83411c173e6338
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 11112 bytes
SHA-256: 7dbb06f98dc95f0b2bde497f341b8045f95636800acc4453988116c9d717c23a