Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7a635a34693353…

MALICIOUS

PDF

76.9 KB Created: 2021-10-02 15:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 303607304fc507909e08767807f22075 SHA-1: 8db0209b12f58825c60c28855f0f3e88f8e9422d SHA-256: 1e7a635a3469335357d79f0a7fcfee1153ae9c44a3ea89ecfb0c5869b8987032
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains a large number of links to various domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lor-rostov.su/userfiles/files/7959503336.pdf In PDF document text
    • http://ural-resyrs.ru/data/file/46035318313.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd3ebade7---64526160739.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/pesarenan.pdfIn PDF document text
    • https://bnovum.hu/downloads/divepevovidu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/safivolabukip.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912112246592242.pdfIn PDF document text
    • http://artdental.hu/editor_up/92403223492.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/dimoxuxulesasuxi.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/vexipexowopedonanumakutet.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/13547244062.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/84992915164.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/95509898274.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/29165693147.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/74796894751.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/41213785177.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/juxubikipeli.pdfIn PDF document text
    • http://synphabase.ch/upload/file/tegumoban.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/aa16549909c220145a47afeb7cd0224d/99692710337.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/mapomujixuferebubogi.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lamaxomiwut.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/domagajosaxamopoviduf.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/povazujidatalaxofavuloj.pdfIn PDF document text
    • http://laduses.nl/image/file/11088628398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+voice+changer+during+callPDF 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_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 10868 bytes
SHA-256: 5a69f8b603d1e3d05ea290630e788625e5fe588cc1b98fa5498804406d05bb0a
font_01_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 19568 bytes
SHA-256: 36621ed8ad0af30cf721e07b1c1dd4abd6ee2ead9c4a047b3897d074ee43d7eb