Malicious PDF — malware analysis report

Static analysis result for SHA-256 296a968a4534e522…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5bb1e53642a63c9a0c6663cb129c4fc2 SHA-1: 176f3502c5f6017236cb1ca6ae2331617fcf886b SHA-256: 296a968a4534e5226ed35b32b4da8b5c7cdc1c6e51fef3353f72b011ec3957aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to external PDF files. The presence of external URIs and the overall structure suggest this document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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://thoitrangvabaoho.com/Images_upload/files/47822661876.pdf In PDF document text
    • http://thienlongadv.com/upload/files/99436476395.pdfIn PDF document text
    • http://koutingchina.com/upload/files/54093861393.pdfIn PDF document text
    • https://schmitz.cz/res/file/zapidomoloweravikakanexig.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd275e8bf4---91736764887.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/6363325267.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/82245440521.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/78851276949.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/66880661483.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4c2557be00c567da6b626800db354a08/94006596699.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/negagotazaxojuzini.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75961262012.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/99505532290.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wapuvajemegaxonakakez.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919173644.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80574941181.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wonezaredofedipewimud.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/99285445303.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/demuruj.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/zuzamewuzoki.pdfIn PDF document text
    • http://abwva.com/uploads/files/96369525035.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/bapipivesaj.pdfIn PDF document text
    • http://metall-press.ru/files/89949278157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+hack+without+rootPDF 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_off0000ae2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 10476 bytes
SHA-256: 9eaee7509484dc1d17c272831ff1e6e8cf5371356ae8041d1794931a623f1a55
font_02_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 14708 bytes
SHA-256: 0e505b21dab1619bb3bee0c37d2ac12e6f1af0d9379477b016c0ce00bbad44f5