Malicious PDF — malware analysis report

Static analysis result for SHA-256 08df19c40e4f3f29…

MALICIOUS

PDF

92.5 KB Created: 2021-09-16 23:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92ee72c5e53f4400b0bd6e39532d08a0 SHA-1: 92e5d84773e7f16e67919f2e34e7b299c2d61e3c SHA-256: 08df19c40e4f3f29e46feb4c37c4273ff17627d75843f14fd4f997ff3f197f9d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it is a link farm and contains a callback phishing lure, suggesting the user is prompted to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 https://esperanzadeavila.com/fotos/file/44833255303.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nabakoxidilumitobiwaxidu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/79390885000.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/fiwulirimiwik.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/biravidi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fijofefewubopugo.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/folate.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/39030083994.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/polaxoxamuvunileraburewe.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e218cc4---49365414317.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/rukosaxopise.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/towikagetapobowexejig.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/51523523729.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kosovujawafaxarubido.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/60212345775.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/10450448099.pdfIn PDF document text
    • http://workontext.ru/media/file/xaladimanediv.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109091113202958.pdfIn PDF document text
    • http://korytnica.net/data/files/wotaxanop.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/asc9nr8tq4fmrg6unl30sjgk66/sepokofadokolate.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87324431299.pdfIn PDF document text
    • https://phukienbep.net/media/files/turetefudar.pdfIn PDF document text
    • http://rjt1.org/upload/files/wudasolemavojawazowejamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=brute+force+hacking+tool+for+androidPDF 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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10832 bytes
SHA-256: c11a010e2b13d3c26be85a4d8d3010f276759d22f1fa5752d622e12541e28c0c
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 19292 bytes
SHA-256: 2630783fa3efbf9534010cfa5a6691e3d87eb2cd359cb6ee857f5317d6b8da57