Malicious PDF — malware analysis report

Static analysis result for SHA-256 8151d05d692c9935…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a734cc62a38193ee46ec1a3ed8620b0 SHA-1: 26a2e52cf2b3d36d49c41ac298d57e48696b4554 SHA-256: 8151d05d692c993560f023fc6672c265f44635cf7a9d5bbc97a7c9df8805b11b
126 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on disposable infrastructure, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.mbk-montage.nl/ckfinder/userfiles/files/56311493120.pdf In PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/pununawif.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/laxevoxon.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/vijopodujizufukimalokoxun.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/36012182472.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/solexefuzesopufike.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/40340536789.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/29861367031.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/bunogovifepivagafuraton.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/pegibarejeja.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/virelotasarukamubek.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/13331831301.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/44578182305.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/12811333472.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/74260070972.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/laguwekagef.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e8fe78c0b9510a5adddcb8178bf2414a/67808826130.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56337519067.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405daf9a0e6---fugifasujen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+itunes+chrome+osPDF 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_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10824 bytes
SHA-256: ab388a18d128cb40fb4d23e26962e17f9783ecb00843dae5da69eb847c0a9925
font_02_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16516 bytes
SHA-256: 9416ad5a09a8b175598a1e1e765927046f48206563fc04dda3376a675bd24f30

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