Malicious PDF — malware analysis report

Static analysis result for SHA-256 d395690c955f9b79…

MALICIOUS

PDF

74.6 KB Created: 2021-10-05 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edcea6aca4026823cd0942633df212a0 SHA-1: 1500f6494592300165211e3d81138c83c5c2b6e7 SHA-256: d395690c955f9b7910a4cdcab0c4756ac04a8c4b86b9e30210752c13574d5f9e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, a common tactic for phishing or scam operations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zvezda-rostov.ru/ckfinder/userfiles/files/88399992006.pdf
    • http://aurora-c.jp/files/files/kapuzijisisirabebirunen.pdf
    • http://sial.pl/galeria/file/61691393761.pdf
    • http://fusiongrup.ro/userfiles/file/gididomegifetetusizat.pdf
    • http://kaies.net/upfiles/211004060638198043rjro40.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326945e1539---30960711613.pdf
    • http://iktoktatas.hu/files/file/2491260129.pdf
    • https://exihomes.com/userfiles/files/fejudilepix.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d7d82a62---fefisilagowomaxexiwilif.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/54774254534.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/modufisozim.pdf
    • http://daithanhnam.com/upload/files/balidedimogodelilozazo.pdf
    • http://zzquansu.cn/d/files/99748961942.pdf
    • http://sun-green.be/ckfinder/userfiles/files/21913241877.pdf
    • https://adikkeempat.com/contents/files/vepokudonagemevefegifasot.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/68047455624.pdf
    • http://prepearl.com/uploadsfile/rudisebapanefejap.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16304798191545.pdf
    • http://connectcontrol.net/files/userfiles/files/23380596131.pdf
    • https://roshnaai.com/ckfinder/userfiles/files/88216266947.pdf
    • https://eclearusa.com/images/file/kefulibe.pdf
    • http://tw-jia.com/uploads/files/202109071420038911.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/fugokitezipopa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=brody+jenner+married
    • 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_off0000c019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC019 16792 bytes
font_01_sfnt_off0000d82b.bin
a1a3d4ce990503f0752e8bd915cded559447f04b8d570f81e60818edd8e2c16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 17676 bytes
font_02_sfnt_off00010553.bin
390bab12cefe8af0d6da4f5f27b7c180f3afb4864d04f15e0a28f2675e831848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10392 bytes

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