Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c6f34e131da76a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 01:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fa1277eb362dad649a63d0ce0f6b22f SHA-1: 1bc93fea3180a68238b00c58a5e7039188835fc9 SHA-256: 66c6f34e131da76ae4f2502810016bec80ec43ec21265608f8de81179bd94072
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'SE_LOLBIN_RUN_COMMAND' also points to suspicious command execution patterns within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=active+arcade+android PDF link annotation
    • http://immobilieninvestors.net/userfiles/file/nasufazuniwipin.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/64014964745.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nimufaxipetuxusineg.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/relogenikadozosumusowuma.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/56811672297.pdfIn macro / runtime command snippet
    • http://misterholidaysanprisco.it/userfiles/files/71168201406.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zagude.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/27327623953.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jokazuzarudox.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tonukefekokifezebu.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109112319506711.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/36317955da70f6f9b30f739698249c91/jifiminujaxesaxis.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/35653738911.pdfIn PDF document text
    • http://alltechsro.cz/files/81899150450.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136538aeb181---ravikesi.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/famuzerig.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/83980653486.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/84948217075.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/5930079590.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/ruzekaxuzug.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021961011282180.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://chenruichem.com/upload/files/22985246575.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/62495568939.pdfIn PDF document text
    • http://uticacheIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 2584 bytes
SHA-256: 487c8fc918114857e28fb5225ac2f89a16daa90804ec5a6292a897e384bc0597
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 17436 bytes
SHA-256: 2183e9bb3ffa211bb2dd392d57af5eeda1c98bb548e8fd9223bccb85f9182e2f
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 10196 bytes
SHA-256: bc0c9ec59bcdefa49153a0e97974378aeaae791f9b2b821d59ae03e35eccf728
font_03_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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