Malicious PDF — malware analysis report

Static analysis result for SHA-256 99edefea4f630fed…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41ed9daa3ed88061a692af60e120bbe1 SHA-1: 36e5479efd99548419bffaaad69a580f2346d13c SHA-256: 99edefea4f630fed9bd72da6df1cf14c1b09cc5a1aa61ec8c01552165cd5ef77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alwaysthesame.pt/site/upload/file/40281292804.pdf In PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/64082909987.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e7119b08a5a6840f28cdf263116c6f3d/fokevujemunotolenejowi.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/26378398889.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///rekotaneropisenoxawolijom.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210902090129.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/17125752454.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/pegowapupakizede.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92939395277.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xawevogubalav.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/sakuruvovejokuxomanodo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/apc70lc4oo8jvhncip5v3i9a52/69535441170.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/74487818158.pdfIn PDF document text
    • http://grandfiltr.com/files/file/xigijikelotufeviwoz.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/90874576988.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/1420743419.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/63080764861.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/42131535126.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/jebetefudubufunababibeg.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/10480174649.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/zugalak.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/55815291561.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/fenevezusivib.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_185857_111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+physics+puzzle+gamesPDF 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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 17832 bytes
SHA-256: 5f9d144d9a9e59a64104a159a2aa67bfa0c338ec1e90212fc93f847038526b4f
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 10824 bytes
SHA-256: 65948b1103b5c0e52217de79d9899dfea588bc27b16fccc22f7ff39209ad39d2
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1