Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dff56b0319d91d8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 01:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6634578c2068e7171cd7240804d7fc1f SHA-1: 2ffe48c5e0eea64bb7df5c72df39c70e895c1fdc SHA-256: 5dff56b0319d91d86b63abfdbda37e4db5698c87aad08c98a50066b92c75eabd
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 are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The file's metadata suggests it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the presence of many external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=how+to+upload+pictures+to+ebay+from+android+phone PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138006c78a99---76865949331.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/28040573946.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xizukemepulizitudowabupex.pdfIn PDF document text
    • http://donghotam.com/luutru/files/ledewazo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/26595934577.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/35283482586.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53707112222.pdfIn PDF document text
    • https://clickbox.ro/images/file/tegopujumozojizagam.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/wupaxonepiwa.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/makase.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/kipesiduza.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nekoluwevilatedo.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050446539326.pdfIn PDF document text
    • http://mopron.ru/upload/files/28846742176.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xozolafe.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4g0da9gmu2r07rpfdjrbmkkrnn/61811683779.pdfIn PDF document text
    • http://meta-min.com/files/lufujibavowo.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/nevitigamoparesobogetami.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/53829243421.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nanuba.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/54302289059.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/birosijevikepuki.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/20765397406.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/titebejarasab.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jigixu.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16332 bytes
SHA-256: 7ce3d2a965af9c77cd18c7512b0efda7a0325847675541bb77138e153c18204f
font_02_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 11316 bytes
SHA-256: 99efacbfc11fb42aa870c8581d6cb21e72513c00fa43246dc5c1f2b6275aec72