Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a9d8a54b2cb70…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 23:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 577ab4e1f499612020ecf9033e8b2603 SHA-1: fa68e6637bde0ce4f4d3fbf4c4f8d0d26d54b217 SHA-256: 7b5a9d8a54b2cb702ba7b0b37d2de00164fdf968bd45ba541702d5625acefd3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and embedded URIs strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fire+truck+simulator+mod+apk PDF link annotation
    • http://2446665a.ru/ckfinder/userfiles/files/31274475739.pdfIn PDF document text
    • https://soechi.net/userfiles/file/65192231328.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/35897698729.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/82307471617.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210910100115.pdfIn PDF document text
    • https://novsport.com/content/File/39401209456.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/wokagarebu.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/31978621874.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/gomebi.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109051725499097.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/nidavukelaz.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/79831263314.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/tarupugezudubasobalerer.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a8880a20c---73854414188.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/34428027316.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/xazeloboweve.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/64729398329.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/savulevil.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/lafimasepe.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/14444839065.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wabatudijaza.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nisijapinixe.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zumonexom.pdfIn PDF document text
    • http://gr-chem.com/upload/files/gedoto.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/28129261609.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/49843289175.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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10740 bytes
SHA-256: cf83af0ccfc1702b5ecb52e6b3c46416bea178dbc6b30492c759d532506a4590
font_01_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 19064 bytes
SHA-256: 950f902b353b51d1c40f95b7499ff78ee82d4ccd94f8615f13a0855dc04e2716

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