Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05c6700fca6860a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 05:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65799d5671f20d1d50a9f708c500f18b SHA-1: 46aa46a0cc1cd550c75820f817c75bb848772512 SHA-256: f05c6700fca6860a4f1e190268e4c6379594cf2b36be269b06cc4f605d12c2cc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=farm+simulator+19+apk+download PDF link annotation
    • https://artesapanaderia.xyz/aym_image/files/naxaxojoworiwijisi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc6b39d0f9c8613845b92b334075515d/47238690142.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/57258091236.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zurubivulofibejogedo.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/32705282242.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/58667818530.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/zizirexomutus.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/ruvix.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/99379606819.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/92149129795.pdfIn PDF document text
    • http://kammed.com/userfiles/file/17820174707.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/24581875093.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/kojum.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/jobotimafino.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/vivagikagowetevowazugele.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/woludato.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loseburudapumo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e458384ce---wafuforuxukekiva.pdfIn PDF document text
    • 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 17528 bytes
SHA-256: 2d61c5249537b27fbf6c629542c2a9c1e117ff90d2fa4dd4c5abb63dd4d80d23
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 10896 bytes
SHA-256: 867650a5bb20c999c789fd5d4f28601442bf4d38ed81168d6a7aaa4899798a03

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