Malicious PDF — malware analysis report

Static analysis result for SHA-256 7495a2b4d21159bb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 02:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c88607a4a25985d299cfc245cbf681ab SHA-1: b3a864b73a2fb3b154afc4169633020875109387 SHA-256: 7495a2b4d21159bb5bc3fecd92b24a8740375f08675072222ad7bfce3b4bfa18
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting the user to call a phone number. While no scripts were directly extracted, the PDF structure and heuristics suggest it is designed to deceive users into contacting a malicious entity, likely for financial gain or credential theft.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://paitoonbox.com/userfiles/files/98210240301.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/57541139077.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/56167102765.pdfIn PDF document text
    • http://lactopad.com/uploads/files/36397102048.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/jinetozujes.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/11854952890.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910163835.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/matorarabobukovininetoko.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mototuviwopafatuvapisuvu.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/xomenaruzukewef.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/fimagigirepaxegide.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/jetaw.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/kawumilavulawafel.pdfIn PDF document text
    • http://melvin.cz/data/xabanupeduneg.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210909_051613.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/54921751118.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/87175006058.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/kikotuxifanali.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/wovukam.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/82452788443.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/60224661514.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1048dd1bead6c05d0538786aacdf6460/filotubigamuf.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910075720.pdfIn PDF document text
    • http://holzbau-napetschnig.at/46802499404.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/79585310577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unreal+4+android+gamesPDF 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_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 17292 bytes
SHA-256: e9a812d59c187bf19e2655a95a2234e5989a52ba0e42ea42346e3d29a5dda11c
font_01_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 10576 bytes
SHA-256: 25c510f0d696afa0d9d5802172c3aa1419b61de9795a083ac6bbc1242056c86c