Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f79415f05fd27…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 16:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9336a59bafea94920316b55096b03e75 SHA-1: 27a8972bc400a6cedbdc54f4c187f6759ef5cacb SHA-256: 071f79415f05fd27463b85663254ed302eaa502625a1c5d219a1177df9f5d437
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick the user into downloading a second-stage payload via the numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://dd-inside.de/userfile/file/bidakozakad.pdf In PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/13641254746.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/53983171560.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/xaxomanosonuverew.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908182825272930p1kwgm.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/58534724415.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be3f93fa6---11045425064.pdfIn PDF document text
    • https://signika.pl/Upload/file/xufobatefokajos.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/10885569089.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902064633.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/jiwudepasuzixa.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/saxavol.pdfIn PDF document text
    • http://kvrhousing.com/uploads/bafujajusul.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/loriguketud.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rupesozonunovukoxo.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/lesude.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/fumugojadogijitasu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/88502752621.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/83798016482.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/4170269548.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://beamstraffic.com/amb/userfiles/file/76990009338.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/99369302836.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+phone+hotspot+passwordPDF 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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 10544 bytes
SHA-256: f222bc84f01decb354584b48ad699b24a50c8d4ae03fea0221ae2849d34191e5
font_01_sfnt_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 18488 bytes
SHA-256: 42c0944da6b841106e838dca1e5c63c82dc2707b0b7fc9b59f176045ecda6eff
font_02_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1