Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525a4367a35577c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 19:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 943bba32b410d7446bbfb90e5fd8649a SHA-1: 3ff596abf00e20596d77ae174116ef383806fe73 SHA-256: a525a4367a35577c558e529d32794c1703d2c783760e5b134d4ec9dcf91283bb
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 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sweed-trans.eu/ckfinder/userfiles/files/71396562581.pdf In PDF document text
    • https://funbugs.ie/userfiles/file/vevafazikiguwubogubad.pdfIn PDF document text
    • http://exim5.hu/_user/file/voridopujunaz.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/71057446928.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/98553228669.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/tunowip.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/48354924008.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/55725716284.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/61488285543.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/27459794842.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/32028184600.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/14310111575.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/44196750289.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dugevejugugi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/31708458965.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed54060ecf---pitujatenefezikosifadi.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109041837237630.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jerurilipaxozibazowasobab.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zemerigelejagigenajuvol.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c35e40536fdfe3761faa82bbc81c17b/62773389097.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/40788680853.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/digekidilizurizejimam.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109091116413658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rurouni+kenshin+game+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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 10788 bytes
SHA-256: 5af13f33b9e0ffc8620e50cee54dbeae968de3c719af6f097c1296d7732acb32
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 18556 bytes
SHA-256: 16c67613b3b58692a266c2a5380511355f96ac65930261b87eaa041f55cae32d

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