Malicious PDF — malware analysis report

Static analysis result for SHA-256 9339da7ccade8909…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 11:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c095b4cc7221bfd754be0bb475cce820 SHA-1: 5d3eaa4959a9186fc2562bc694079270d42eb22f SHA-256: 9339da7ccade8909064e851e499c29fdd58125cd4d10843a8e84041084b72d96
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CALLBACK_LURE' heuristic confirms a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bawaconstructions.com/editorData/file/17355686542.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393a1f1647f---79839117859.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/41726182167.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/94222484480.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/judezujafisuwuwomowigu.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/67517859109.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0012fde8974ac480f67e281823ce1e98/zefazavoburitebadididod.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/wupuzegil.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/83136923709.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/jedezurevokuvubaj.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/44882983222.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/mikowu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/47841746619.pdfIn PDF document text
    • http://vinmexindia.com/uploads/95761833745.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/gasevuxelikivoto.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/96080121450.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/jetorefuruxolel.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/vunokuzusajifinizowo.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/lizeworitu.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/suwetojose.pdfIn PDF document text
    • http://balone.net/_upload/file///vugaratolewenonoja.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/76007100009.pdfIn PDF document text
    • http://elsped.hu/files/file/voxuruxuroga.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/daxikufori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=office+365+partner+loginPDF 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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 18544 bytes
SHA-256: 0ea6b3f5c4c51d5350e35ad837a2bf72673b251013161be377ccf8e1e887f586
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 10988 bytes
SHA-256: 71710ace75ab37e576a72d8c954288649cdd6156cb1132724ed358c216bcb329