Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9ed0cc8fd16cda…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 02:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5fc923a1fc859400405b084127eac219 SHA-1: 76cf6245bb5ee8684f19578bbb7b748139638c7d SHA-256: ad9ed0cc8fd16cda222464d6238a12dda2d234923fcb84da683c6dce33b037c9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or solicit direct contact for fraudulent purposes. The presence of numerous unknown URLs indicates a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nriloan.jctoursandtravels.in/files/12177394593.pdf In PDF document text
    • https://hophamthaibinh.com/upload/files/32186743802.pdfIn PDF document text
    • http://zuche0551.com/upload/file/1641522133.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/83215719625.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090411511473499.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/dozodoniwadubifuwu.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_D715ED5C13E7A24A.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/59141147810.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/foxiwozukuzanaxobuvobot.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisirev.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/titalitawuniwolojutewubu.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/wagobupadunatixurigaxov.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/53723065575.pdfIn PDF document text
    • http://mfcpavpos.ru/file/9521899058.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/vapipafizax.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130033c17437---mosokowenilifewutilisa.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/22021758857.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/032256271415.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87686920c---94119453036.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/ximoxusu.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/sokomo.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210915_3477BD015167C451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=auto+photo+editor+software+free+downloadPDF 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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 17032 bytes
SHA-256: 9175402e5a4b40c310fb47d874d440b4538aadaed3d935b7a6ea1754d2ad817e
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 10764 bytes
SHA-256: f916dc6d73802d26a97cf4e9f8b9874eefae05604e5d4919b3dec47a63ada022