Malicious PDF — malware analysis report

Static analysis result for SHA-256 84aa07bb85d84c62…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 10:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c8fb01fca432bf6d2d5c719f199c3cf SHA-1: 54b2f9fba27e8fdcfb2bf471d48bb834a48e6e3a SHA-256: 84aa07bb85d84c62610b9c545911887e34d282e0832444897988facc81a9ad78
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=planimetria+forense+criminalistica+pdf PDF link annotation
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/muzasoda.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/fedukenewuweru.pdfIn PDF document text
    • http://ladna.pl/user_images/file/88647137318.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65359639316.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94972070319.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/95145039160.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/747fe93dc4d0be76704c96ba1c6860c4/40653477973.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202194819511959.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/vajofalagaw.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/jutugabekavibesariboja.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/7385542106.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/14307389435.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/15611471108.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/73602729919.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/99084755316.pdfIn PDF document text
    • http://kotolantopeni.cz/file/fujosikefavevibepirasapo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/62044165381.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/79283586404.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/41057418539.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wibevinabumusupo.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/mekeginazivewu.pdfIn PDF document text
    • http://hnspkjx.com/d/files/84781129795.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/fegazuje.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/26733429735.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/zurivajategewex.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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 18224 bytes
SHA-256: 0bc318fb51b0254464855c3c92da854d6b6148140f4507897fe2a88aa960294d
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10780 bytes
SHA-256: 28c7cfb5a6f17a07b3e85a3a4b45ea2225b11f290aba3c4632a707c54d8ca5ec
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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