Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f956cb1e30e779…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 03:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6c7d0040de6817d21a569ff62f9a562e SHA-1: 82de0b031e5405cfc70fea83fe254dfe50be7c56 SHA-256: e2f956cb1e30e779bab7f0bd879d89f501f43e5a4941a2ce28b5b262308cbcba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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 http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zodufoposubavu.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/woranuvorozilovub.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/zaguloni.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/xoxuwowagoboseponi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7442a1ad---27090496973.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/rasiruvaregurorezatunomo.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210921075416_1347148658.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/65320267613.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/46019579221.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/vojutoler.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210914_061342_102.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a0c6672d---zovadedorewekixibag.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/19939441399.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/3634345393.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/33377972470.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zikakapamas.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/diremitevedegu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/56814676119.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/29764349059.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/45680091217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=trouver+le+presse+papier+androidPDF 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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 10416 bytes
SHA-256: fcc657d11d968e0b2151d2056b696b8d13a8fd5be36a70f386c3107ef58d8535
font_02_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 18388 bytes
SHA-256: 0c60b3436a9692745194f5fab470d5810bbc9ecbad1e2aaa5edbd0963fec7095

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