Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbe6bc647e839a1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b54480dbf58a787612040112116faee8 SHA-1: 01cde72d61e8d5141f7238a54edc954553711807 SHA-256: fcbe6bc647e839a1913608c317d57b1f977256026415a8bdc025843af35d542d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The presence of these external links suggests the document's primary purpose is to lure users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=how+to+stop+spam+texts+from+email+addresses+android PDF link annotation
    • https://bostaninsaat.com/image/files/wadinuti.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/goniwovamegigo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/62546703725.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/31301117195.pdfIn PDF document text
    • http://artepcb.com/upload/files/nipuw.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/dufisefuni.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/30698113229.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/betubikogusuri.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zofasifoxewazana.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kejodemabibivudurufufelum.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gujaweletadi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/15195479961.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/sukojabobakijuxawe.pdfIn PDF document text
    • https://euchebnici.com/img/file/kefapivigukexanejosukove.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36990057743.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/baxiporiwogozot.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6138127418d63.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/25914347934.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/82133199456.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161435da43f126---mukijimilom.pdfIn PDF document text
    • http://telektrans.hu/editor_up/wevuvuvikoteninematufu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/50647130633.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 18120 bytes
SHA-256: 916a36bbb927de99573aefc4ea5ca16d83351742652bfb0c4e9e3be0f5f3a4d8
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10840 bytes
SHA-256: f78ae0a8f5759cbe5df0ba6192c6c2ec34934a073899dcf09855265dbc277323
font_02_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1