Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c1ebc73dd1565…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 01:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41945180ab265e485c7090f42acec671 SHA-1: 343432ef7debe9d1ffb38419bb106ad8ec940cc2 SHA-256: 368c1ebc73dd156503321f1c98b7658924e5162d115821762d1157f606b91534
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to a link farm, with many of these URLs being hosted on disposable domains. The PDF's structure and the presence of numerous links suggest an attempt to direct users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://noursportevents.com/wheelmarine/userfiles/file/vazafamatifo.pdf In PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/maberojurob.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/61833181955.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/dusizuzadugaperuso.pdfIn PDF document text
    • http://chinalabware.es/d/files/41233981927.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/jezutovi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090601194773499.pdfIn PDF document text
    • http://inercial.es/uploads/files/zavivevisusuxekoniw.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/18222142595.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tipuwewidiza.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/naxunovedeve.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/844511904741631337350.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/winiwosawobafozepopub.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/gotivimulogogasurabozafer.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/92716461447.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/zujepikapilop.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa4951bcc---21117641146.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tapuzuwefotalavini.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906124725_fgjrei.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wajutuvexilad.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/91855858146.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63711904635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+block+a+website+on+my+android+phonePDF 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16484 bytes
SHA-256: ccb6cdb5889dffb6677f65d4f20718a1af4297bde5d82a92c718c799f2b791ce
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 11200 bytes
SHA-256: 5eaae2db460710d2ce44222b5079c142dba9496cd887a42f90fce2ff9403a528

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