Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe6e31c6f0cb4b8…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 08:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c17f2a92eed8fb8ae8a3c3f115b6d368 SHA-1: 69d7a9a28813cdb1a4fb66c1c84bd260f82fcb90 SHA-256: 7fe6e31c6f0cb4b831c1bb6087f88c3f8ef84f559917ad139b1e8b28bfed48b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and a link farm heuristic further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410eb6c8b01---wanuwodegalevuxofozed.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/mesomidowijanusinujo.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/zuwobo.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/jirebobeka.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/34189034456.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/79352625382.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/98584129253.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/mijasixekedagif.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/todovigaw.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/26384652696.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/23819133165.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/134840772.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/22137320778.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/mudefemaroxatoginebitof.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jejobekenonekobisuwamapa.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/66836302586.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/powajuxewetopatadufafelu.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/fitowa.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/1444066722.pdfIn PDF document text
    • http://feminella.ro/upload/fck/wusav.pdfIn PDF document text
    • http://retailcop.ca/files/95672119907.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/47292801652.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/xokad.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/56286350649.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/80462036820.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/51809089619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pmbok+5th+edition+pdf+free+download+pdfPDF 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_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 18612 bytes
SHA-256: 2fabf71c34a88525aa591b798f8f3d46c05b21e1ec464fe9c41cf6a57f389d16
font_01_sfnt_off000136ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F06 11048 bytes
SHA-256: da79eccc833edd983c8b1493e0530921dd1daed5ccba2a4aff20b5d06c9eaca8