Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf3d3535047761b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 02:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bba5975c34fd378bd04bd7c99485dc67 SHA-1: 01872d312c9e35f01186c176475ea261675764f3 SHA-256: edf3d3535047761bfef9b314a4df7116c8f8caf45432ff8c11addacac00d8582
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads or redirects, consistent with a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=javascript+reserved+words+list PDF link annotation
    • https://sailstudy.in/ckfinder/userfiles/files/saxedifip.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/17430629378.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/wokinorofafepibuzonare.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/75693420864.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/83707091814.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/70928660195.pdfIn PDF document text
    • http://lex.tj/img/file/21139360735.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/75057531659.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/kewilogapibawuluga.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/88544990038.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/73952517894.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/17624690074.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/19559022197.pdfIn PDF document text
    • https://citronel.com/userfiles/files/lowitolirilobote.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/7784900673.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/82777860950.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/radapodegadiruzebozesasab.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/buwif.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/91757294861.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b253b195d---66366662630.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/3115103954.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/zedapigamodifelotaxox.pdfIn PDF document text
    • https://noddy.nu/images/file/woloxifogarosinaninu.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/derekavavotimajuxugofef.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904232747.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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 18632 bytes
SHA-256: 1accca1f30bf1cb443c522b21de71807194826a772aade187c4bd609c1392fa0
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 10548 bytes
SHA-256: 749433cab3c76e1f88daad7a2a4e25f9ecf48f5784304e4867c9c47594416e58