Malicious PDF — malware analysis report

Static analysis result for SHA-256 733debe387e47002…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 11:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69ad64ac6640bfb3a08e7c572bf45287 SHA-1: ba2b66b6c99a1713a8245871fdef8587901fd1de SHA-256: 733debe387e47002d349b77c0d6ea7069d4629b3605a6ca9e25df71a60dd1b3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=how+to+set+memory+card+as+internal+storage PDF link annotation
    • http://nena-artspace.com/ckfinder/userfiles/files/dajipoloralogefirad.pdfIn PDF document text
    • http://gapp.fr/medias/files/bivefetitubi.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/62008119716.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90758646436.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/46012707096.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/pesaremow.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/77a7696be48351581d06d1b2afd5592e/zowabisegi.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/43877501864.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/9785114221.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/9450884139.pdfIn PDF document text
    • https://labelmarket.eu/data/file/wajizuj.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/godef.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e3803fe4d263698e72bb9d5f26b4b687/70801458183.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/30898073682.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/16395575625.pdfIn PDF document text
    • http://baoveantam.org/upload/files/71072709808.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/13208577797.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/tukepavalaw.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zemob.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/fubufiwumimogitip.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/97477207500.pdfIn PDF document text
    • http://dgjst.com/upfile/file/18785020423.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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 17524 bytes
SHA-256: 9f3e38caca625fcf285e776648f40d9f50b712f00efccf5772b10dd979c2bb3f
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 10904 bytes
SHA-256: 7a22608bb15b0a86cfa093852693911de5f3b18566d702ed0fa82b095b86103b

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