Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b191d2d52da440…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 05:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5514c4fd6d034f22c919da24b40edd8e SHA-1: 1b20c11cd1592abf0b78996e751f356e73bf3095 SHA-256: 53b191d2d52da4400e59bc3affad8ba8e8fc671bd85dd6ef5cf0b2347ea4b57b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://queure.ru/uplcv?utm_term=tamilrockers+2019+tamil+movies PDF link annotation
    • http://www.jindatunnel.com/up_files/file/31028274895.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/niwulomido.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_99DB476776D9EEE0.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/vetigoxabuse.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mefawikojafu.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sivibudetuzajufubod.pdfIn PDF document text
    • https://podimercrm.com/img/files/47687676115.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/60301705036.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/99246391581.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/dudevi.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/makejumakapepe.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/funezip.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zubewotomez.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/19524336139.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rinizisitiwoviwawejel.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/93486634342.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/doluzovesugogavirut.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/xebudokexavag.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/49277974867.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/tegunewafajoseg.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78352019965.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a37be21f---vuwitif.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/nuwinobadaripixetulez.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2iujonh7l5hlfd891chjnt9lc3/73375589903.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/72536440263.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tewixowenefozepanuru.pdfIn PDF document text
    • 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10868 bytes
SHA-256: 2c1abe2c1b91770f307c321fe013e0b99f152961aef60a0baf3f9ca81c1de5e4
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 18624 bytes
SHA-256: 4cbfaaa65e68dac58a868bab68f2e65022e77df966222eaaa97e3fee122e9f34

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