Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf530fc3a30c1279…

MALICIOUS

PDF

79.6 KB Created: 2021-09-24 10:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fd55749d552447c11d8a612cf663a35 SHA-1: 481a86140ad3ee3c65593c428b63c3c80168fc11 SHA-256: bf530fc3a30c1279ffdb3738b105322a286ce0102fdc0ad7001b3d623c4de66d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maconlux.ovh/userfiles/files/86608297580.pdf In PDF document text
    • http://senseoftourism.dk/userfiles/file/pinekudajotabusinavuzak.pdfIn PDF document text
    • https://temahr.hr/files/jolebotalumobagisem.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/1752494976.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/82773581133.pdfIn PDF document text
    • http://theponghop.com/upload/files/54086326111.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/lebosejilujidesuvur.pdfIn PDF document text
    • http://contua.org/userfiles/file/zuvitofibovokivevutogega.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/niserinogubimepu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37809294682.pdfIn PDF document text
    • https://ntc-container.com/upload/files/34870809267.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/67713189204.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/77780448241.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/zudorigowin.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/makegawig.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/xawofewumojoziruw.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ae3476615bec81965dbec542889b0091/fasirojex.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/javajas.pdfIn PDF document text
    • http://cartopack.be/Images/file/vulenisusiki.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/regaseme.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/58264428905.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/terenofan.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/zekutazixel.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/7282860695.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/55241712666.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/41474724477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shelby+gt+500+1967PDF 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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 17864 bytes
SHA-256: 44be963e8585a9e9b7171bb159a18b4ee06120fdce08a921413232d61b184692
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10664 bytes
SHA-256: ffdc070285dad3393899dd2b1cb931205f3054b823c3714166009c54171e6a26
font_02_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1