Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc6fdb3d341ddf6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 12:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 648b5907c05c37e4343a3f72addfb29e SHA-1: 7600c285ad38f6e0790516f129d5d1f84d65dc8d SHA-256: fbc6fdb3d341ddf6d803dff25586e979a2fa0bbc37902ff484281af694c1a39f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for potentially being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=nato+phonetic+alphabet+pdf PDF link annotation
    • http://alrabbancapital.com/file/files/dutudelujodatedif.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zabuzez.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22760176104.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/zojenani.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/29192887495.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/74582160904.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/97281032628.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/teluzawawitemusugefid.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/53018946243.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/besegutub.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7add2354---kukafiwi.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/1534128673.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/gewevupopugojekevadofi.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/39761123676.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///nujomufikunelamufovazis.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/logisamupelimu.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/jebikigu.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vobomavemoleje.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109031627184490.pdfIn PDF document text
    • http://praguetransfer.com/files/file/61034143529.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210908_14E2DE8968E83FFF.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xupuwiwada.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132efcf38591---11543320392.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kebepafema.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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10568 bytes
SHA-256: 407c659ad821cc0eace01af5b6dacd2868acc2856fe938ebc8b925cd1b6db402
font_02_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 21320 bytes
SHA-256: e87a500265bb5ecedb891f0da49b1bfb15ec8a27286def5805cf3b3ba7af5991