Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9d586d3159b9a6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 22:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4f85793731551af04c4ddcd70a1b5dd SHA-1: df4673586d1f7f748c8710651fafcd5634f68281 SHA-256: 3f9d586d3159b9a653cac81574446c8e660a724664cb5b0c652716711155c0a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://drafthe.ru/uplcv?utm_term=gray%27s+atlas+pdf PDF link annotation
    • http://qianshunqs.com/admin/upload/47930918461.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/5355975828.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/tibojilugubedigogotemu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kinix.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/kazovurimosakelij.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135748596bca---28316728842.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/7825919431.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/buziw.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/93113207085.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/155197756613bef35b7465.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889182a8ef---64580364214.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/tiroxepozuku.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/74095109838.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/monupupuretatelurutole.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/31331887876.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/pemidumet.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foritoduwagab.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/30345415038.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/29037228437.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/fidegamejepujanezajud.pdfIn PDF document text
    • https://atlantidegattico.it/file/gezep.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/zezapujanemurokerokokil.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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 17652 bytes
SHA-256: 7cd3b39d9f45b10515f1918b7e32c5ed9e1956d476a84db0cb159a64fcf26797
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10228 bytes
SHA-256: ed29dabb35bbe1da16fc05ca5e6027fc803b4de8f4f6187fdae09c28f5b12ae7

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