Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf82c87902f1cdb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33b616a07194bb627ad58d03fd54365e SHA-1: ec2766c15c25774c16daa143c3e801d9f7f1cc71 SHA-256: eaf82c87902f1cdb77bb3eb6850216103353c7817f938e97f0a3cb8f010b61b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous URLs, many pointing to disposable domains, and one specifically identified as a link farm. The PDF's structure and the presence of JavaScript suggest it's designed to redirect users to a network of sites, likely for malicious SEO or to host further attack stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://jjburgerut.com/uploads/files/45948652422.pdf In PDF document text
    • https://tigapilar.com/upload/files/2292330043.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/kf4gck63sbaa9e80a7a0iadhre/barisofid.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/vukekejajijud.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/93599774931.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/74215007051.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/lipuvitujepoku.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sudubofoda.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/de833h3c5vo4lu8k97vdlchdp4/6912916557.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/95080368915.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/rikozunowume.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/51180103641.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jolepunodazevem.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/74323417449.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/20661622204.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/51515875323.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sitifexerujuz.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/vafaf.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/12984812380.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/fumapirukorotexako.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zavafesilol.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/42368129965.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/labenit.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/30232786667.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/momefajabazusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+bible+thiruviviliamPDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 10252 bytes
SHA-256: 17e323c6493112383e04c66ca0740f4089d23bd337f5ec06dba34568b69dd311
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 17416 bytes
SHA-256: 7064622deb08cc8ed285257694ae3eb9a78b7b8135a1e20b711a65330005ad90
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1