Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bda64c5d78806b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 02:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a280a42713f7521a9211b99108f9366 SHA-1: 9c7e31e74b1bd8ef3b329309d48c93f755dd8220 SHA-256: 17bda64c5d78806b31323d126e1481519fa0640de9a274af9a3e1692d7a9e019
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or credential harvesting attempt. The PDF structure and embedded URLs point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=resume+send+to+mail+format PDF link annotation
    • http://hpworld.hu/data/pic/Image/file/2217221142.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xenowuzaruwaroromewo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/giwutowipagoxemide.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zapimodavejezaf.pdfIn PDF document text
    • http://budka39.ru/files/pufobakerevafuw.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/51066951824.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/70339870457.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109091906126645.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xoduvufilebaf.pdfIn PDF document text
    • http://guowangcable.com/d/files/32377411514.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/tolefagulivogemifoxek.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/31569894586.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/daxokivepugegizu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/51544143306.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/6678278812.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/38012613407.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/15046504644.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48388556184.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7384df9ed6d45a403d47b5e6bba09e8c/95043393936.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/82976932877.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109160506375873.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/71234097968.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/89828380000.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedfbe2425---pibedunejewa.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_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 17332 bytes
SHA-256: 3eeb48da083b1add2d67c0369ecf528d5b942a5a4de45f09dc79d559520b019f
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10660 bytes
SHA-256: 3930027a6a135effb26c3c07053d844baecde25621909db6a044d5708284cc12

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