Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb4e47a2cb1b4a5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 19:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf00344f6d55144edd2f518c7b6fe13f SHA-1: 68f862ce0664f9c0eb89982b25e8b2701d764c33 SHA-256: cdb4e47a2cb1b4a5bf413ec963ca50e8e0a48386c29e7aab890cbd5b683b9ce2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=gd+speed+hack+apk PDF link annotation
    • https://travellifeafrica.com/ci/userfiles/files/devuvikidoxuwepijowiza.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/99294838894.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/42547392058.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/mifipeg.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/welikiribogoviworak.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/56304995872.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/3039816300.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/28138767022.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/daporivib.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/gaxisejejuw.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/45748927514.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xinoreteminawun.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/73197511196.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a412135b9a---97829461283.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sezirusakabodokatemavo.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dowira.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/29105144111.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/18540784368.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pezowatudileluk.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gufulu.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/71634721077.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/ziporavomobisajusi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/lubaxasugizuwatobapegelo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t8k9ihh2ec47u6oslsa6rqffv0/45889422973.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/39235292729.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_off0000b8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D6 16632 bytes
SHA-256: 00b4771f57c5cec7ff2dad39cf1db42995e2c3562915dad36395772437329ad9
font_01_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 10180 bytes
SHA-256: f0121ce4e7d7dfed88ca10a685305ef0c71fe9d209859f8d48e198e2c7af8ab2