Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfe85b27766907a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 05:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ed1a6dd25e1ae1bfe854c7bf676ed5 SHA-1: d7b9775bde8e341117d243da6328fdacb8631931 SHA-256: edfe85b27766907a659c6e7ea0633fe37ea821909cfcebbb0d8de500fc5e4fc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://ht-cooling-j3t.com/contents/files/5535736808.pdf In PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/50894985642.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630949336880057138.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/77704756392.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/xaxodolosabavevowu.pdfIn PDF document text
    • https://venus-forever.com/image/files/15496468611.pdfIn PDF document text
    • https://cmoretv.com/userfiles/zuvesepela.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/66516689014.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/73109287235.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wonoz.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/nebelajewuz.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/804360660613524430f8dd.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151334534884.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909015848.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/rixudoxajogibuw.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/90649063531.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dogaligebilujijebefat.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/82964932666.pdfIn PDF document text
    • http://davcpundri.com/css/file/munoz.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/semidakobawiwewikutega.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/26036242315.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/segukuvolas.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mafivoxinutukefuwu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/farinubujo.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j3ng5qe5itoh6fqpl6snpfv1ca/40160670274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=coin+8+ball+pool+generatorPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 17632 bytes
SHA-256: 75f8cc0135051b2ca993faa320307c4dfaa6d8c9bbbba61b1e05cc7f54450a1c
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10636 bytes
SHA-256: 0f8d73f7957cf088e1410dc4b748f9f906ea0e78c04b15815dcc4bf431159a4b
font_02_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1