Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec6b8684e1fda1e…

MALICIOUS

PDF

70.4 KB Created: 2021-02-16 08:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ad3818f876bd3a5bf6efa255e538df9 SHA-1: 77d87d7aac840b8aaa7c81ee56ba954041d15737 SHA-256: cec6b8684e1fda1e8f77e48f14eac8394b8219af57b199215107572633179fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains keywords related to educational content, likely a lure to disguise its malicious intent. The primary attack pattern involves directing users to external URLs, which are often used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=cube+numbers+and+cube+roots+worksheet+pdf
    • http://dabutaxezopis.iblogger.org/bike_boy_photo.pdf
    • https://cdn.sqhk.co/fogibadeku/eshijaE/child_care_development_center_new_delhi.pdf
    • https://cdn.sqhk.co/jisaside/jijhjXJ/biwipuwubisovorupote.pdf
    • https://cdn.sqhk.co/wejagamewo/XhjUQeS/51246110228.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602040387e4d2.pdf
    • https://cdn.sqhk.co/seseniluvus/ii9ghhb/golf_3_gti_0-_100_km_h.pdf
    • https://cdn.sqhk.co/gonolesuzam/cRLldjd/pemulozodexorixizikum.pdf
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/62d2434af1.pdf
    • https://cdn-cms.f-static.net/uploads/4489240/normal_601c96ae268b4.pdf
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/dc74a.pdf
    • https://cdn.sqhk.co/niripakexad/yclhhgf/28446113232.pdf
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5fe103994d617.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/fapejiramomojinu.pdf
    • https://cdn-cms.f-static.net/uploads/4383340/normal_6029a6d688f28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuxekote.rf.gd/afterlife_parents_guide.pdf
    • http://disefubukub.rf.gd/80180477265.pdf
    • http://gipanigiwulaj.epizy.com/bhojpuri_lokgeet_birha_song.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000c1b8.bin
ce24e54e04c6aace037b19524bfeeb54864f86bc6ab39a356a58e19d5b4ff3e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 5564 bytes
font_01_sfnt_off0000d481.bin
4c7f5edbad9ba161df1a6a65c28a1443ff83020122b25abfae92e0241fcb2b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 9960 bytes
font_02_sfnt_off0000f6ca.bin
6bdf0468782905378d7f9f876db6c07b19d5bdf3f84934a4f4983aedf31f7953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16236 bytes

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