Malicious PDF — malware analysis report

Static analysis result for SHA-256 af74d3efc439144b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 01:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0becaf54f1dc5917b2ec889ad634b43 SHA-1: b890d06029d82352fc02ae2b1f0a89f6b75a173f SHA-256: af74d3efc439144b319c2104b3295e6445782ee7190758f721dc249ceb8cf9dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=ph%C3%ADm+kh%C3%B3a+m%C3%A0n+h%C3%ACnh+%E1%BA%A3o+cho+android PDF link annotation
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nifadizewibomuketoselo.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/66223634380.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/664dd23605be0d34620c9f4f03f8aaa9/xafomuzomawinufaduwi.pdfIn PDF document text
    • http://warehousetraining.ie/images/88994185814.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/24787232186.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/43301904413.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/ropugoropitexigurojiwom.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/34373997535.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bazujadekumideloratoremim.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/ruxusazaguwajadegavexugam.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210918021521_nkbh6m.pdfIn PDF document text
    • http://usateatop.com/_upload/files/25196113912.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f571c7505---ratamij.pdfIn PDF document text
    • http://fitviewer.info/files/file/15762661514.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gexenegelezanesi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/90814363033.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/bejudikojena.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/38303785494.pdfIn PDF document text
    • https://southafricapools.com/contents/files/fafokasisuratane.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kezogavobosaxerodago.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60055146750.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/63593372828.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10968 bytes
SHA-256: 497c86599d9acc8da714f53a0dd098536c082d7b095bd44d3b59a6d55de3f6c1
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 28880 bytes
SHA-256: c7b6314b8c6c5fa757fefc06a852308a5f3b264e45fe44498d9d941d55af5b26
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1