Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ad09c9860a9742…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 09:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5763e832cf1a633f7449c13785e6cb8e SHA-1: 1dfe83302a507b0dcb3b565155fe6723bbb4330c SHA-256: 62ad09c9860a9742a8c7a38db5444722df343faf0adda837eea8ee20d8592aa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://banquat.com/userfiles/files/96348616860.pdf In PDF document text
    • http://srilakshmienterprises.net/uploads/58089550379.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/97225601787.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/73575241439.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/49170813111.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/27549023045.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/82632920227.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/butukubawupe.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/50598086610.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/67891087053.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/fetavuvekevuxijej.pdfIn PDF document text
    • https://777mto.net/contents/files/gasufumujawez.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/21892460856.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/visukavajazut.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210923111920.pdfIn PDF document text
    • http://www.bash.cl/media/file/57931605039.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210911_072901.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/23999201419.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/fegenikel.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/60266327979.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vejagixupox.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec6f39cf26---72882700450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=check+instagram+followers+of+private+accountPDF 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_off0000ad44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 11304 bytes
SHA-256: ab659459e9dad076a7ae752fb0dbcd8e461ef439afb0b3bbfbe0390b8066f6e7
font_01_sfnt_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16404 bytes
SHA-256: eb20c6e0e896e791e74884ed00004b4e859d2c8dc725595346a0c7dc2cf844ef
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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