Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dd6bf6bd0f06cd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 22:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2378a55ca464e00ad912915d40a11f8f SHA-1: 11d321aad832aa020204d475ceabe90e04f05686 SHA-256: 80dd6bf6bd0f06cd9a697521b3042e8dedf1fbd81a74a25780b59e308ad2f574
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the large number of extracted URLs suggest this file is part of a link farm or phishing campaign, likely intended to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://pixomot.ru/uplcv?utm_term=where%27s+my+perry+full+unlocked+apk PDF link annotation
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/tibewaxadatunikikufusox.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/88043188543.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/43653588973.pdfIn PDF document text
    • http://briztravel.com/upload/files/kukiluzetigunesa.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/guxepisemegevusonalo.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/44089766971.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/9214109936138861b41d97.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/16894565480.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/3603576771.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef02cec68e---20404596195.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/63246014367.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/bipezokinis.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/46001006129.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xemegovozuvetofisara.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wakuxitefutixaxiwiro.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/tivoruloguvefo.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/sirukigowokexibaja.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/43921478351.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/kilerefinilutivaj.pdfIn PDF document text
    • http://cascad-trans.ru/files/zixada.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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 18184 bytes
SHA-256: 92dddce263edc1b539f69b27d5dbc3134ecde93866351b5c7b61091a43106eb8
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 11028 bytes
SHA-256: 13c93fd42c5ada8e1feac6507724218d35d6a3a11295689c359701f884c5a8fb

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