Malicious PDF — malware analysis report

Static analysis result for SHA-256 8171e39bc2e10296…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 08:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6ec5765926997a1cd7988ebe7b7dd9e SHA-1: ac6c4359fbcca7790388dae4603811c9d33b4c67 SHA-256: 8171e39bc2e102964e1fd7396f4664d2dc924cc58c01e8f9d6214638134b5bba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm designed to redirect users. One notable URL, http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba90ac68---dopakemarabitu.pdf, appears to be a direct link to a potentially malicious PDF. The presence of these links indicates an attempt to trick users into downloading further malware or visiting malicious sites.

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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba90ac68---dopakemarabitu.pdf In PDF document text
    • http://tcgardening.com/userfiles/file/2021090501274973499.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/74596641699.pdfIn PDF document text
    • http://oris-am.com/editor_up/sigamafonedazu.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/xufumagipotirujipexumu.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/75394640661.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/wagoparekiti.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/sawamodu.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/55613665673.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/81318029980.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/55153731874.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/dewiguxawomupuzepided.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/sejodulutilakukumezinube.pdfIn PDF document text
    • https://migger.dk/userimages/file/24692082921.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/69115554646.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nifotob.pdfIn PDF document text
    • http://fitviewer.com/files/file/35646493739.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/89074043035.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/texagikitigu.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/61735759507.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/mazevosigexo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jiratipagoxodevuvomep.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040604502710.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jogevufevasupopejo.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/52497832504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=devil+may+cry+download+apkPDF 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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 19320 bytes
SHA-256: 70c8437985155209b98fcc66e60041e976cfbd384dffa1545023c3d902e3f40b
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 10768 bytes
SHA-256: c7de37dabdec45ce89a4b1a34cf519945e711fe3fd0fd68cf2ef3ec7773015e8