Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67e11ba717ff4f4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 11:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1e764701a1fe1397bbd5b06b1c8db24 SHA-1: d8b8a94ccea49e49385c24ecb4aa4833e117998f SHA-256: f67e11ba717ff4f4c428c0574c2cdd198b7fa1ef951bd305f3330356b30d00d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it acts as a lure or redirects users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=kali+linux+download+android PDF link annotation
    • https://seikai.jp/free_images/files/75297913862.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/97435822337.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/tifuvugobovowe.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/bunemapazepofanafupikanoz.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/26772376747.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/xivabemuw.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/refurunofupup.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/vowugafugorikubonufa.pdfIn PDF document text
    • http://rayanchem.com/d/files/84350985766.pdfIn PDF document text
    • https://redac.ch/upload/79247670090.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fawovikovukijojiviroroz.pdfIn PDF document text
    • http://grabnerestriche.at/9451964959.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080237506346.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/97726195817.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/41829320493.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/wemozizagufovosula.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/16447870952.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/12022906363.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/6100457566.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/2548587045.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52679236287.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/68859723239.pdfIn PDF document text
    • http://pvvc.cz/files/felof.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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 10120 bytes
SHA-256: 475af3a21f6e23d536a0f3c8fe4f6b5d2a8575bb76b94b76318505b77d1d1889
font_01_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 17828 bytes
SHA-256: e837af81d3d41a6649ef40bd0e157b98768c178a230074af5af4fca63d40b535
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1