Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1d73bf36a1e972…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 22:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bcf2f6e52295bdd44630a9eff41603f SHA-1: 67a0c5c33aef48e0c31314edf3dbff77dd7baae6 SHA-256: fe1d73bf36a1e9725c5221e95b4e9b9a16b9a16d4f01a6133668076d828f74eb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=lark+player+download+music PDF link annotation
    • https://0900107678.com/upload/file/18772285811.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210914_4D0E4B541914C507.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fipotorufadulu.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/xaxagitizupesadiguvaxun.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/51640474562.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/87071778710.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/begasa.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/1484295358.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/84003554825.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/70330102974.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/46461555211.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/56302507066.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/fovararezovenabis.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xusagatavow.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fd57f58---susigaxobanejirikumumeza.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/77869699620.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/87781492239.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/48548203473.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/zewulomesuluwaxibijojefu.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/40185791703.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/1444066722.pdfIn PDF document text
    • http://regcureguide.com/files/files/38362996713.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/2053986815.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 16272 bytes
SHA-256: a6cf1fe35b0a6c0ee8b5d465880b6c7f7da88a66870549219cb9a9bc0587be97
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10924 bytes
SHA-256: 14900f5f93ff6e0400663662e47097b044e0fa3131d883beb96f676a1dba8bae
font_02_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1