Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad5916fc3cdf916…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 02:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec8138b417446ac7bf868bd28be2129c SHA-1: 20141d49cedc6d54f5c9df2452dacc216975ec97 SHA-256: 6ad5916fc3cdf9163523d7cd830ed3d5e3ccfcbd1a8c5a4d859c7b990472d1f8
134 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary function seems to be directing users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=how+to+make+private+calls+on+android PDF link annotation
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/54433415598.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cfd1a5f4---29293360417.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/51451973871.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/36542913640.pdfIn PDF document text
    • http://myphamasia.net/upload/files/madubuvokiwatanimasij.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bebikirose.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/28329945240.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/91554891276.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zogovaberapotevozisufik.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/majoxakix.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/muxabikag.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1c07b81f28d9e7ebb329250591d0ab58/11602881058.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/jogefazaruwaxidosumat.pdfIn PDF document text
    • http://mobilenmr.com/files/files/1363833706.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67296323424.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vetoferenu.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/27500541762.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zopazuwexiw.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/62079574753.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/kejaratuvedeluwawofere.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/lerujapinidadew.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/wedijarenukiluvaxav.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 10908 bytes
SHA-256: b5a5356ef29ad5561ee426e56eb61cb303967e73f97b9ae3870245b294de87bc
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 18536 bytes
SHA-256: 807c55275df211cf452f705e6f4b7a6af6e4ad9a6f71edeaf88275754340e487