Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f71b9dbe38bfab…

MALICIOUS

PDF

79.1 KB Created: 2021-10-12 18:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f59b0697348a86229b66e8783d4741d SHA-1: 7a583c5b3b098fd4bf579a835c170b025f03f487 SHA-256: 38f71b9dbe38bfab71e29764f4876db6e562564c1621bc4bc3d0d139532174ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://eros-arena-reutlingen.de/eros/userfiles/file/raledimupokeralop.pdf In PDF document text
    • http://ministryofrum.com/memlogos/file/wazin.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29340d928---lotaj.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/dufegunufozelufa.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zipanuvoxenivatulokurake.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47375919386.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/dibumuxagerirobexuni.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/81201763641.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109171632544359.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kijejexo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/22613546153.pdfIn PDF document text
    • http://freetds.net/userfiles/file/3415858435.pdfIn PDF document text
    • https://slide-bearing.com/d/files/jodomotel.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/lokofekexeful.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/8009303241.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/wobujojesopegib.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/54395383030.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/sogidutuvamaxurexod.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/gakopafo.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/gewudibume.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/53387052281.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/81906988654.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=tooth+pain+inside+toothPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/72987137875.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_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 16952 bytes
SHA-256: 73530c967cdc28146b76700ed84bb53fb7e7179725c4779d4b5001cab621123b
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 10304 bytes
SHA-256: 57f8ae4a465d0862e0c87cee95e0b25249987bc6f62d47e9eae756fd63db7b41