Malicious PDF — malware analysis report

Static analysis result for SHA-256 97932078537579c7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 23:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: def6e03e7c7723fd82a75cd82850b516 SHA-1: d661f933eba65d5002443e2f8258341757969093 SHA-256: 97932078537579c76711f56ad813ebe5c64fe0b490c0d9972666de1ebbdb85e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm, likely to obscure malicious links or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carshopm.com/js/upload/files/95277705344.pdf In PDF document text
    • https://tckontrola.hr/files/liropunamonumawu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/lumuzobixateludidewinit.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78860390652.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909011106270.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/dumajejobozanoxo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/4487126861346c4da5faa.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/wumidopoxi.pdfIn PDF document text
    • https://izr.fr/files/lobawijezorulizowe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613170ebc5781---ditopoxuboral.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/67438237351.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/92010564330.pdfIn PDF document text
    • https://elemonbg.com/Files/File/lunawokudinuse.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/dinogepu.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/91534871482.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/fopikodivifomezafubewosix.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/10293410345.pdfIn PDF document text
    • http://med-os.com/user_upload/file/gepawajozavej.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dafaxar.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/mexupajerigikekomow.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/nimofudurugifora.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/luxigopimaxekoweta.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/40898056383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+pokemon+fire+red+loveromsPDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 10808 bytes
SHA-256: 4898cf93e0c23e3b6e29af425888d9c2457263b5afd460f25953d4f1adccae80
font_01_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 16392 bytes
SHA-256: 5e51d0e1c7b7c5c6083570761bbf1d71ef62073cdf63fff2ed8353ecb93a79b0
font_02_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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