Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f26b3aa28a8a137…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 13:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d34298237e44188cb0e221c24347040 SHA-1: 0921d284e73d66ef7f9ea5cdbbe22970585b973b SHA-256: 0f26b3aa28a8a137622e3332bd7de1f9052665d54c3871f97d4b51b302c2f22b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or redirection attempt. The presence of external URIs and link farm characteristics further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://moneymaker-gold.de/files/xifugemifavogixitoxodizev.pdf In PDF document text
    • http://capmar.eu/userfiles/file/98890673516.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/85553911288.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/webomibegarudamenobifa.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/kulewodivinivo.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/6022465630.pdfIn PDF document text
    • https://e-room.co/userfiles/file/zebevejokax.pdfIn PDF document text
    • http://aprt1day.ru/file/mimesarivi.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/46478253672.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/lefizibot.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/46172830369.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vezawejenasum.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd05615---norudexuvebofufe.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/7445448129.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/rorugelube.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/95867936473.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/familujetotosidufunef.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/19374693388.pdfIn PDF document text
    • http://workontext.ru/media/file/59456253244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tabou+game+cheatsPDF 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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 19524 bytes
SHA-256: 7886664beb26abadbe69cca29a52c154d6c955b9d70129c5a0e86cc65ef8273d
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 10540 bytes
SHA-256: 8a99fb8dc4deaad092607844f3f50303cdf9c4c67eef6580d5e8bb8c6bec4bb8