Malicious PDF — malware analysis report

Static analysis result for SHA-256 28871758b8e7215d…

MALICIOUS

PDF

67.9 KB Created: 2021-09-23 07:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a079d5dda3709b3c1f2c6c9ef60cd43 SHA-1: 144456070ebf621878084853e08184ea6b414d33 SHA-256: 28871758b8e7215deb8a5921253380c555df4f90dfcd3074a2c09e62daa9218f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to external domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious intent or evade detection. The presence of many unknown reputation URLs supports the assessment of a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8398

Heuristics 4

  • 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
  • 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://abwrva.com/uploads/files/95813694865.pdf
    • https://dukra.sk/editor_uploads/files/lalivivixiwutu.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/9439361466.pdf
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2309062302.pdf
    • http://daoltrading.com/userData/board/file/62352995313.pdf
    • http://babywagen24.de/userfiles/file/kobinakuwagekobovajodumer.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15330574224.pdf
    • http://membranekeyboard.pl/_data/file/gigabokifewovisabajobaru.pdf
    • https://omprintandpack.com/userfiles/file/tavujavukalowigijite.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e345be631---xipivefazasujitujirebojed.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b471fc2bcc---9682074220.pdf
    • http://opsir.eu/files/file/56582825060.pdf
    • http://rovitek.com/userfiles/file/dowegugi.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/49626025180.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/gonujixovukiwiwukufida.pdf
    • http://www.anclupnapoli.it/userfiles/file/nudoji.pdf
    • http://chunmianxian.com/upfolder/e/files/20210906070937.pdf
    • http://cutyoursupport.com/userfiles/file/bivom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bowmasters+unlimited+gems+and+coins
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bb.bin
15dfe65d60a699b0d76b4478c11f5617361b18e25657f00ff2a6b095258905ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 17576 bytes

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