Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1d0048f7eb41e2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e2a81583622708e88220097118bce24 SHA-1: 59c01625a813748e3a6b6a7ba0d1142f625857c5 SHA-256: cd1d0048f7eb41e2343d390836c9aab69e52289d931f524ef1f99f8fd6118ae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=united+states+of+tara+streaming+season+1 PDF link annotation
    • http://sudeoksa.org/userfiles/file/20210903232153.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/21879826076.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/9953826871.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/nusopemedudigijolusu.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kelisavidapevusedajizekit.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/luvifimugakozepupubapixi.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fofazebonazuxe.pdfIn PDF document text
    • http://cityfate.com/files/files/72457464672.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/susokilagukavojinuxo.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/35017846842.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/2484233826.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/tejimopogapopezem.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/99930176480.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/58393555616.pdfIn PDF document text
    • http://swhos.com/upload/files/tujemuge.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fapafodo.pdfIn PDF document text
    • http://recviem.ru/img/upload/46420145919.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_221031.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/bogidi.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/85088601106.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/51636504212.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nexitoruxipemirifen.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68988844770.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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10712 bytes
SHA-256: f5ff0740fd204eb129682b373110e57d5e9a74a4268e74e469c081909922ae91
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 18340 bytes
SHA-256: da827e57575aace56bc705a5d036f2f6d15f43f2630c0753b8f4e645199a4b9d