Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2a9458fb693782…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 15:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74bb55f6934f51de606fcd89946a16f1 SHA-1: fd4a35da0a15be45b423f87ad87e2be41cb7df33 SHA-256: ce2a9458fb693782eea2e099c01879d95f87fcc5fa0ddd55c7667aaca5479d33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The authoring application 'wkhtmltopdf' and the presence of embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=irandam+kuthu+online+movie PDF link annotation
    • http://border-collie.ru/sites/default/files/file/wagan.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fosuzebebe.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109130252008349.pdfIn PDF document text
    • https://songhongresort.com/img/files/59105513245.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/91617479553.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/74306415671.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/23316068187.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/87109046757.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/roxewesixemev.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tuwexurasenurebij.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vasarazajazonov.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/36191019248.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/vojenowovixefejidol.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/deperovega.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/3007853488.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/60965337509.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386bfa33a2e---15715033994.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/fokasubinurepadalu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///7221008606.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/buporikewarak.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/wexodugoxobabirifijo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/66693456181.pdfIn PDF document text
    • http://tecksco.com/upload/files/wibogiwubemenuk.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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 10552 bytes
SHA-256: ea03c95107289dacec7b9e41100c300377ca0d3f2c4482d8776c79fed86cd853
font_01_sfnt_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 16128 bytes
SHA-256: b0e1066bcdcbd3eea0731489de6d9bb8779bf40c91251339b39cd1d9a7e98829
font_02_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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