Malicious PDF — malware analysis report

Static analysis result for SHA-256 f469cd03592338c5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 16:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 278892cddaa7eefc47b78bdf6e08842c SHA-1: cfaf6776897bec1b8973f8c627a8ae171770cc9f SHA-256: f469cd03592338c5a93da44cf77886680ded75362d7b1c9b446a6b5d81ac250d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one with a 'utm_term' parameter suggesting tracking, and a heuristic flagging it as a link farm on disposable hosting, points towards a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further suggests a deceptive call-to-action within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=what+is+a+firmware+update+for+android PDF link annotation
    • https://asthasupermarket.com/userfiles/file/12481160846.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/19598504438.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pomuxemidad.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60983296652.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/dusapilavukivekexuwax.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/71648619766.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16138e29c821f6---22841221857.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/31418113806.pdfIn PDF document text
    • https://mattress-leader.com/media/46145700014.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/89816480669.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f3802059f42e847f617700863b65f5e4/vipopedumofekupakasus.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/50874872662.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jirezepenasin.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vifawafutokuzalu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/zesamurulelukidusigevupo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gurugesaka.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jeterus.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/suxexi.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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 17320 bytes
SHA-256: 20a3ac6385e895982e8c0c29044fbfce9dcf1ef65f090a2bc7bf72ad0b1b6426
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10896 bytes
SHA-256: 274411b081b91553df2c59286fe5336dc9decb3c36b01f9c81aa59d7a2065e38

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