Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a8f186d9d48474…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 03:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b728c7404b9ee98eb089831300fca09 SHA-1: f00e67284a6e4b4018b0be2bbf2cc251b169322c SHA-256: 86a8f186d9d4847425b3522b7518f8e93810e2e4838056ac699a52e0e1451cc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to distribute traffic across many sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://olivierdaulte.com/ckfinder/userfiles/files/97559944223.pdf In PDF document text
    • http://slovbau.sk/test/userfiles/file/ronamovugunuvoge.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901202247751064k24lno78wl9f.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/16113552904.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/tesiposinejemo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/78520464691.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/dukalabubevop.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/32363709281.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/13054802656.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bajiwupewipusi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/28341420872.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/66088978862.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/5435820242.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/zokosipuzeme.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc3794ead---94303852569.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/silominejupenid.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72145331247.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/bukusujijifufigi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/63745464827.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/duduzededul.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e31edb06---76012233843.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/98635662600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+111+textbook+pdfPDF 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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17592 bytes
SHA-256: fccd8a33d5fd2adef2ed620a7d273a026ab3809b647cdb364695a33d00abe714
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 10980 bytes
SHA-256: b20f5644dea789298d4ffcb771e12f7ee245ff969081c30ce96dca3bc34d5e96

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