Malicious PDF — malware analysis report

Static analysis result for SHA-256 be906139138ccab1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 10:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9133732e904ad15f9cca9ac937f710bb SHA-1: 2c5ce468f902f6e9f3e7e9ba694967f3e260e612 SHA-256: be906139138ccab1467d229d42d61b3107cfc92bba32169562ad3524056db41e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, indicating an attempt to trick the user into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=dbz+tap+battle+mod+apk PDF link annotation
    • http://stlukesfp.org/ckfinder/userfiles/files/jizikipiwiwegenajobup.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/xapixasefowaxigi.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zexeremabolano.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/68197107523.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/rexetikufejowufenimiki.pdfIn PDF document text
    • http://csp.hu/editor_up/88417445912.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/87550242265.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/morixafuj.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/kokebaziwikuxuvusitig.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/28030238c5c41802fbc8a209fd90f3eb/12413850496.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210905_B2BCD6699960D78B.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/rofevuva.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17716411708.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910224341.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/49753513991.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89554272833.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/5626725615.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/29181393623.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/78840572786.pdfIn PDF document text
    • https://sanidom.pl/img/file/vibodawu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4eb1df97ba871c5db32ddb6dff725fb/lupoduxakujor.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/3260839491.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wugomulutitedidowikereji.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zenixeniviban.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/ditenisep.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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 18268 bytes
SHA-256: 500874f08f5bdfac07d1cd2cab9fca27ff7098b653d6265400f29b871bb9f973
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10384 bytes
SHA-256: 35ab85a56e2b73617b81feec36504e2ef2ed7c610fa86f363552ef24768fbfda
font_02_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1