Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b83261f8beeceb6…

MALICIOUS

PDF

97.2 KB Created: 2021-09-17 09:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 291ce28cce3c2b4e9a6da5c70e9aba96 SHA-1: fb025c0f2ed66ae1bf5674e2ad2ad8fe8c6c5449 SHA-256: 1b83261f8beeceb68cb26b711f7ddee5ded0e363574379e175a2143590d962ee
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. It also contains numerous external URIs pointing to disposable domains and potentially malicious content, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://inwebjor.ru/uplcv?utm_term=sachin+saga+cricket+game+apk PDF link annotation
    • http://web5gstore.com/Files/files/nejezitejabowuweruwab.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/vevedevumilororoguv.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/26299551704.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62270409419.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/zonowufudejovig.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kusosif.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70b80bc71---zefovadeturamadofowevet.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57194099195.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kepurugok.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/59311650353.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/46059676362.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/nikulipufimeduf.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/mozesazilono.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/72536222878.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pukoles.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/78046487226.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pukufipelako.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/puraguwiri.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vikatasuzosotixusiwit.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/71117896273.pdfIn PDF document text
    • http://smogy.ru/files/files/silolidejalen.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/fomuduw.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/rawatusemufenamavomada.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_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 10824 bytes
SHA-256: 186ea40100e10d11218c4c67204ce2e0b5f466c431ca8ac231a0c3a28e8eff40
font_01_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 18472 bytes
SHA-256: 0cc86dee26a4cbbc4ffacc8256659745399f543e5287ecd50b386148e8d0689b
font_02_sfnt_off00015f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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