Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d1cc5e11605f9b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 21:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 22ed8969f22f74d0ba1888885e9d6015 SHA-1: f804a5fb2c5e5e495d706c2a5080eaceb0d87288 SHA-256: 19d1cc5e11605f9b4475a3bdf9b30913dcb6eab02477c358d5987e7abe387676
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical heuristic firings indicating it is a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, strongly suggests a malicious intent to redirect users or serve further malicious content. The document body was unreadable, but the heuristics and embedded scripts point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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://mr-alian.com/upload/ckfinder/files/61517114346.pdf In PDF document text
    • http://bubb.cn/up_file/file/naxukaworebapuderogidotos.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/91442992559.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161318df726505---dupasigezezizopa.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/dusanufosagipelusimas.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30323409419.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/84277013246.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/29310784445.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kupokaribonixajefipaven.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/26174636680.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/89997909016.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/80185531214.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/79752088539.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/72073742843.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/vuloxuxojidov.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210902132710_kl9ivu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/pewakisapugazex.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1de56d28bfce278f70483815084aa0d1/51111023260.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/55073943328.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/90790201751.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/xanodejonuziso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gangster+vegas+5PDF 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_off0000bb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 16404 bytes
SHA-256: 678a12730a21470e8150e9d349fd5875ea3654a9e9a765ce0a52be5977ec814f
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10264 bytes
SHA-256: 476db3f881aae8e9fd9b6411d54efe795329e2dcc16ef0343210694f2679cbf9

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