Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc260a901612bf0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 14:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e6acb36c279b6a47a74859f54ba3566 SHA-1: 515fab699de2f703eaa47085b58c7ca18cecd4d8 SHA-256: 1cc260a901612bf0a6d1d128208fa834a05384ebc8fd8c040cfb814ade09a847
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://durgabas.coop.np/ckfinder/userfiles/files/xovak.pdf
    • https://dianthusindustrial.com/resimler/files/vigugewuxaluvebetosuxos.pdf
    • https://yodishit.com/uploads/userfiles/file/19177183882.pdf
    • https://elger.cz/fckphotos/file/32733367616.pdf
    • https://charming-dc.com/uploads/files/202109112137383731.pdf
    • http://eca.or.th/ckfinder/userfiles/files/wagixitebirunonabutimaju.pdf
    • https://lawina-radom.pl/files/file/bageduzezal.pdf
    • https://matharu.ae/userfiles/file/zowovetomokijefulegemut.pdf
    • https://kingyao.com/uploadfiles/files/20210904_213250_9701.pdf
    • https://artinterior.bg/userfiles/file/13249168446.pdf
    • http://fd-health.com/upload/ckeditor/files/bofujuzepizu.pdf
    • https://bawwabatrizq.com/userfiles/file/detojoxabulomoguvo.pdf
    • https://makanbanyak.net/contents/files/12878384728.pdf
    • https://cristalensi.com/public/File/tofesoduw.pdf
    • http://mictrogiang.com/userfiles/files/33670924249.pdf
    • http://novafish.it/userfiles/files/leriwunomo.pdf
    • http://ihdbd.org/upload/files/67584370563.pdf
    • https://essaidafm.com/uploads/FCK_files/file/83792477329.pdf
    • https://almuhja.net/ckfinder/userfiles/files/tebidizofudejigitadufob.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713da4b243---73536048041.pdf
    • http://aftp.bg/userfiles/file/korawazimewipipamabuvomo.pdf
    • http://storemisr.com/uploads/files/xemuporudaloraw.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389921f5e2---59726195088.pdf
    • http://kirsanov-maslo.ru/uploads/99111847696.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=complete+anatomy+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e199.bin
d6b94dc5a16883a21d10fa37caf3044fb8b3713ccc91deee7eb700542a242f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 17020 bytes
font_01_sfnt_off00010da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
font_02_sfnt_off000125bb.bin
68d4474c910e117fb821132ba51caf9af9eeff3b7b1e10a8c8a42d65446dc33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 10528 bytes

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