Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba662d3b14bfadd…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 22:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cf408fb2db0e4da40877ce266706076 SHA-1: ee33c4cfde1e2dea213fe7ddbfdc2e9380f403bc SHA-256: 4ba662d3b14bfadd9dc3137f0beeb5deb911943313bddb3ff9a16a00aa41db59
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=fake+location+android+root PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161334a7a3ba32---sageguniginosewarulejupa.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/52842926936.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/01b6d6bac06f28d780990347894ffaaa/lakiziwegafamupolamepume.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/lefet.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/raxawizepapusaj.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27061332945.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/54071118151.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/tidiwodivesamife.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/61285090501.pdfIn PDF document text
    • https://bagstyle.uz/images/file/risesidog.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • https://digireg.es/upload/tipezawobug.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/33089954459.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/xavidazixume.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tilekiwovumowifadekidod.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090311221673499.pdfIn PDF document text
    • https://olterus.org/contents/files/18219799790.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630536776.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/56210008972.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/99156417258.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/73103182289.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/67471249009.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dizekuj.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/sogazu.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_off0000b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A6 10264 bytes
SHA-256: 923dd0a8a3f8b6037aa6d3f196bd1aedfbf8743922405aa8fb233c820d1ac5a7
font_01_sfnt_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 15908 bytes
SHA-256: ced4536f1e69a8db99b97e118d781ad8d26a2b5222c4d75d6fa978f543ff2d98