Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c620867c7d1d20…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21f2c0325e0856dbde6009b721076fc2 SHA-1: df06f5c10190f08a34737cb274566b85bf6df392 SHA-256: 38c620867c7d1d20f402298c8d5392b2c6a6bf581a3a1f55d3aeb2a0c37adb9d
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, suggesting an attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a deceptive download lure. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://24emk.ru/ckfinder/userfiles/files/50095254062.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/zedawaja.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/redap.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/98858075069.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/54878207551.pdfIn PDF document text
    • http://fpole.ru/sadm_files/76141442837.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/72969359468.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/42808344061324138a24c6.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/rigadodatisagojunuridover.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/dexilawoletilije.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/worinisekakanafitif.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffd894487---96194547625.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109131850374623.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/wubozubutujixivixobe.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/daviwiborirolaxevuwi.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/82386136840.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/vubumunafitigosorukokosal.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/puvupilakufokapajutes.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/13983681756.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/64305715564.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/40498510713.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/mekumizokizuvugitipu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/11684007174.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/70951093928.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210901_064601_195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+killing+torrentPDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 10112 bytes
SHA-256: b8e13d1a3c39fd43585d5fc076147b07983a7a0def3cb242effc3cef7bce3c99
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 18600 bytes
SHA-256: 91e36a0707477fae238e35bb62df5ce0a7a5e5dd9152f20a7eda8908ac62bb7c