Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc59a731e558f6…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 23:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3234cbb1c7c5b2cb235b7ccad843d8e5 SHA-1: e8325c06fa77165e492950975ac76d5f6b3d4380 SHA-256: adfc59a731e558f68c32433d4888a09402e5d2915e1ce0ddeea0fc9e4d1da1a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=bijoy+bangla+keyboard+apk PDF link annotation
    • http://biplano.eu/userfiles/files/23359426803.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/14953355492.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/81680177142.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/56624660222.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/18477037233.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210904_100008.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/07b57ace7cd6879f2750c5517902826e/85022871641.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/32588819462.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/fujubeguxa.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/66273084696.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/42988259368.pdfIn PDF document text
    • http://fitviewer.info/files/file/1467821887.pdfIn PDF document text
    • http://topstec.com/d/files/40012791833.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/12399436220.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/zonad.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/dukokawibudizareniwifena.pdfIn PDF document text
    • http://vlajamo.cz/images/file/76132541.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/70208230976.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/3965201142.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/varaxusuvozivadujuvuzul.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/jevebe.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/95108984081.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/38873161220.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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 10828 bytes
SHA-256: 55fc28b832977674d6dc8fa2a956d1d281d1955c60dd6ef45130767c3956257f
font_02_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 16300 bytes
SHA-256: 47fe4ae3bf8ddec577426c79bcd07864ca914e8c245026f272c3e259c5e74437

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