Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7bd1da1adb2270…

MALICIOUS

PDF

80.3 KB Created: 2021-10-19 06:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 835ebd63632208d2d881fa9a84aa7e7b SHA-1: f032a037a1b22901dabfdd214c3fa7fcda9d58db SHA-256: 1d7bd1da1adb2270a333199ab6605f68b09e5728724d18ba1400cec4fa1ac096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm on disposable hosting, with numerous distinct hosts and embedded URLs. While no scripts were explicitly extracted, the nature of the PDF and the presence of many unknown URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d752f8bf842ff708d86a0f6623a5431e/mulugupojevapob.pdf In PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/dixojuja.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/tekab.pdfIn PDF document text
    • http://scantech3d.com/files/sanilemetogimanewaruza.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/66709642041.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/vovatuzof.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zejekenaduvakisuzezorisom.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/41475027884.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/newizafulof.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/vamusebadedasijafidari.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/31314001430.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/panekatokedagozujodu.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/kisuzegaw.pdfIn PDF document text
    • http://sun-eko.eu/files/file/tudufuv.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/dufojojogodule.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/58421277369.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20211016_D2C0A21BAE6A16A7.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/55368572162.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=what+oil+do+you+put+in+a+hydrostatic+transmissionPDF link annotation
    • 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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10856 bytes
SHA-256: 6038a3877d8c10d1a961eed12f84ab4e576be02d40f943ec9a03607f99e2c860
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 17388 bytes
SHA-256: f6775ffbd8b3a43de2a54f70af8a02b6bfbf8a49b3df779584b45fb0a8264c16

Open this report in the interactive analyzer, or submit your own file for analysis.