Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ced7cd86682879…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ad0faa1843de3815d9f77f72f9e0902 SHA-1: 0dec1e33ec8bb973cdb3c2c378e0140a5b324c6a SHA-256: 23ced7cd86682879aae0be3c8a46725d3d424b827e8452e82c42ab82b9902406
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://pixomot.ru/uplcv?utm_term=where+do+i+find+downloads+on+my+tablet PDF link annotation
    • https://eprobatdz.com/ckfinder/userfiles/files/korivodogas.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/vulobidalivoduvokovimam.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bosuwari.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22370907172.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2922926---39088132407.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/ginagadibidu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/43028162004.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/20798015882.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/39868656418.pdfIn PDF document text
    • http://myredm.ru/uploads/file/rebutiwerivunifuzujip.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/17018891114.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/83584133076.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/28678821289.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/48285499658.pdfIn PDF document text
    • http://www.puhito.hu/uploads/vatodupizasebirowa.pdfIn PDF document text
    • http://hidropro.hu/upload/86346734930.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/49809997219.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bonositupofij.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/rufuvilazok.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/raduvux.pdfIn PDF document text
    • https://trieurodata.ro/images/file/66521395339.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/75768097535.pdfIn PDF document text
    • https://novsport.com/content/File/zelofolosidukafisiwaj.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/jepufixoxaguxuketisibo.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 17732 bytes
SHA-256: fd326f4c989d4bebd70912f310950636b0b445db69d43efa2ae511c034ae58ef
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 10952 bytes
SHA-256: 0de939c2066969523b7c42ca59e7c9eada251c0ec16cf1a300ff98490e11a439
font_02_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1