Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b513cf9c30227…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 09:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed115448795e3eaee73c540b937d2dab SHA-1: 3eb5f04b900d2e2d175728a84ce04005a158dfa1 SHA-256: 5f7b513cf9c30227a8a3964fa2f7ff01d8722bccf155ca9814deb859f8f794ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document 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, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lure victims to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.la-providence-ehpad.fr/ckfinder/userfiles/files/42784463255.pdf In PDF document text
    • http://hunicorn.hu/userfiles/file/16709231152.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/71184075052.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/69052797942.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/dimoj.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15469593894.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25582604588.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/73125528572.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/fipejobexinemugepibotom.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/voxigidavetu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/89296093450.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/42045555737.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/70299922867.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b824a8e2ee---59000697019.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/wobunobekudokozofomev.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9f78c7b1---79680255903.pdfIn PDF document text
    • http://sinostandards.net/upload/files/kiboxed.pdfIn PDF document text
    • http://chayka-svg.ru/files/15714026192.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/3790324381.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/22355386063.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/tezelegegogizufawajukegog.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/gusowojoxinibesifulo.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53878175829.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sifeboteniwajagipixosero.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/38874333178.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/somexolepabuxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+google+developer+expertPDF 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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10384 bytes
SHA-256: 87507cfd26e7b4e50c596eb763b166ef7c9cff89003e7957fe80e19ea2e7c8a7
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 19964 bytes
SHA-256: 34e7236b412362de5ce452f9042f88b5137d41787da572d6594a0863ecdd37f3