Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0559f22c5be775…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 20:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f66ca5ffc2ed6c74c79f99c18405ab0 SHA-1: 6552f65c5a5f84e29d22aa2d816b83b8a893eb6c SHA-256: 5c0559f22c5be775b49d49c31d9d5b547af39a233a49e62c8100182b89fa0017
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=convertidor+de+video+para+android PDF link annotation
    • http://eunlocker.com/Images/Editor/file/miwenuxivametebidi.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/muvokewusesuturulupujerez.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/69922088816.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/zoliliposi.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lizujusinevorenamikoneni.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/fikedokej.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/70817988455.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76912557750.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/44913529049.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/ruduwosidifowopa.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/gotepetowifalerifawa.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/2910277932.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/dedap.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/8464708102.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/jomokur.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/95357151647.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/56865797945.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/jasizisalonunum.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/fixazuwerodejika.pdfIn PDF document text
    • http://kodemari.info/data/files/gudozor.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_off0000bd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD41 10268 bytes
SHA-256: 32f5c8b1695570fd8ed061deee94a2dd0db3732803bd58dae6b51a28d87de4ec
font_01_sfnt_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 18148 bytes
SHA-256: 4feb43a2bbaddb934c3a01c2b6335bcc60ed7080e8feaa76489805e4bc30cbee

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