Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb71213c4a22d1e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 12:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a4c49ab137c7c51bee48a7cf10d6fac SHA-1: 52dab91367cccc154ecbbc47488f008f998a505a SHA-256: ecb71213c4a22d1e3d1943d80afb47bd3278e2a7ba99e7b92cccc9e62be7ba82
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, combined with the 'Urgency / deadline lure' heuristic, suggests a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into navigating to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.halpellet.hu/userfiles/files/rixoxokaxaxigiziv.pdf In PDF document text
    • http://hwayoung.kr/upfile/files/26233996334.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/toxikijosovusodutubabe.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/45356736107.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/filimidulifinegirapef.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/56738383091.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435ffbea767---85164628802.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xeribawiriz.pdfIn PDF document text
    • http://coachhouse.info/assets/file/gewufifepagowaf.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/figozijizokosizufikata.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/31815334039.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/5270341511.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/24674034580.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zogenonibadirofurokix.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/ledazabib.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/lefekalilewizejeruru.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/lawewidirirexe.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/51418175566.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76467229497.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/topajajopozovamel.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xisowufejumogobidavo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/41550991770.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/veboru.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/xasilanadunogoraka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beta+messenger+appPDF 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_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 18084 bytes
SHA-256: af2b2afce781c678ef0e134bbcd7e259685a8fa3ae5dc22370ea74accd17a719
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 10392 bytes
SHA-256: 8aa77d3ce1f3dad668e1c19b87684bca3cfb1e28fab29e2116cfd6c3fe56b6fc