Malicious PDF — malware analysis report

Static analysis result for SHA-256 f602dbdb67d0a422…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 01:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9939e3c118367e679d44f3423bf8606e SHA-1: 30dc775ce38b7724843c358553ac4681ae878dcb SHA-256: f602dbdb67d0a422dffbae37a9a7e56049fd6c310a582e8602c9638139485913
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF structure and embedded content suggest it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://qbcar.ru/ckfinder/userfiles/files/76433124718.pdf In PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/pesaremow.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/roneneg.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/budafet.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/14328470509.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/85544469017.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/28086106470.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/47721566397.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/fepudakezawisasodabuz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bexajoradunajigosofamo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/11637977176.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/30475780152.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b79c0d62---dagarokapipenax.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fanakajesixibevojozep.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/90032921171.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/gunodaxasumurugi.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/84639258837.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/jumizivamolavu.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gotawokopiviwixapibogi.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/6224157702.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f77e10c41---vuxumobumirasimenivi.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/13879628714.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/zuzafapiv.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/50000498526.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/98302751899.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/fesavabadotixov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=keyword+ranking+tracking+sitesPDF 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_off0000c288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 10780 bytes
SHA-256: 8141bd1386c24f132ee272b666f4be721b4a4060b7f6d56d01e237a82ac4b8ef
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16608 bytes
SHA-256: 809784a0c8558c52bca9cf11042e86ed9c387b1fb5d6ff8b184ef15cd67585ff