Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21f154f4fb3e0d7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 15:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e1b440151ad95829e315f177b04e8d1d SHA-1: d64d3460981e55168eff181cf23f8c4710736798 SHA-256: e21f154f4fb3e0d7187607d10d5c5d94681f8eb715f9f2a6e8515da276c1b119
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with a high-severity heuristic indicating it's a password-protected archive lure. This suggests the document's primary purpose is to deceive the user into downloading a password-protected file, likely to bypass security controls. While no scripts were directly extracted, the presence of numerous external URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mayphoviet.com/media/ftp/file/59860543172.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135246f0baab---17195743638.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/desefariganolotokezil.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/kaguzuxalewez.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/penibaso.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/59990297819.pdfIn PDF document text
    • https://somogyplusz.hu/files/zogig.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/60997773528.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sogirafuroxumozuwapolu.pdfIn PDF document text
    • http://bluebossa.pl/files/file/35682358609.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89141671929.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904055102293119.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/53124654302.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jiwuraxus.pdfIn PDF document text
    • http://speckrepej.com/upload/file/rixedo.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/11258310062.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/50188417706.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/bubapozovorebofalazid.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fizegezo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d20eeed8523ec0ae0106bcfbe3e35fb0/gawuxewomurud.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/zebudolax.pdfIn PDF document text
    • http://pololanna.com/user_img/files/92822870278.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/34269748528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bt+yahoo+loginPDF 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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 18732 bytes
SHA-256: 323ae367699e044476ddebeb566068a05e056e89573248a4978ea48b5993847e
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 10156 bytes
SHA-256: f81718c107ea0ee1f4cad6f938034ffd6947fc3f6a634567a80334f2f702cd3b