Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bc058506561cad…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 02:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cc33631505620c2e0c1638c60bd6334 SHA-1: 0b20d5016349e8ec23438fcd1a25f284af65b6ac SHA-256: 20bc058506561cad218d74cadf5538373ef0bf310deec07af8301b10a81daf8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS points to potential exploitation of PDF vulnerabilities or user interaction to trigger malicious scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://huntic.ru/uplcv?utm_term=parking+fine+brisbane
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/99057692806.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/96482953882.pdf
    • http://0vote.com/ckfinder/files/nazukapedifulajepaw.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc54d46149---76436908822.pdf
    • http://hycxchina.com/filespath/files/20210912202533.pdf
    • http://jagdrevier.hu/upload/images/file/wobudakavanuxotojel.pdf
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/86968406917.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/58259286668.pdf
    • http://dainindo.com/Uploads/userfiles/files/xarigalipaxakatiruvek.pdf
    • https://z87992961.com/upload/files/20210920105103.pdf
    • https://ptogel1.com/contents/files/94295995086.pdf
    • http://tsrmmessina.it/userfiles/files/wazoneketomuwitazitosala.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/lasebabarogekozabedenobo.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/69549884050.pdf
    • http://prasongp.com/file_media/file_image/file/pikodasizipipox.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/2441393773.pdf
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/5114773802.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/62437763611.pdf
    • https://karlschool.org/uploads/files/202109062321446956.pdf
    • http://ttmplus.com/userfiles/files/90375086864.pdf
    • http://chiangmai-clean.com/user_img/files/67138498671.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/11373239111.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db03.bin
c48567d0941b4eea560a8a34706a733b9bf3febfe044659ae6cff6581e3e5f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10356 bytes
font_01_sfnt_off0000f285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
font_02_sfnt_off00010a97.bin
abb1750428bc2119ece8adb60cbebf9706ac0ae35bb0aebbd585a0429a8cef34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 17688 bytes

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