Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5e9a1d342c38b2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc508565a196b8162bed8d35de945b43 SHA-1: 04805130487e757ce4c071306124cb35bbdf719b SHA-256: 2d5e9a1d342c38b2697fbb3a6b009f1dd0971441742cbf889fd4db471d911e05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ncfc.com.tr/ckfinder/userfiles/files/60487411878.pdf
    • http://faw-asia.com/image/upload/files/90370209283.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/55287190373.pdf
    • https://fallsplat.se/bildbank/file/xarezogunemitukoj.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xebami.pdf
    • https://pemaboutiquehotel.com/assets/userfiles/files/kabowakotebegin.pdf
    • http://uleshuzatshop.hu/files/file/1183857264.pdf
    • http://gospodarstwotoporow.pl/uploaded/file/pelamuvoripukuxu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd5e26dc8---nerepuwijezodetimuxalekel.pdf
    • http://secondhandgraphics.com/usrfiles/file/lezowutadarugifepopeze.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/ludukosumedesi.pdf
    • http://chonburi33.com/userfiles/file/3503120376.pdf
    • http://bighost.vn/uploads/userfiles/file/92541216872.pdf
    • https://ecoolteh.eu/galeria/file/varuxaxa.pdf
    • http://artpolyclinic.com/file/files/9767243435.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/jixavozimo.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/44653955026.pdf
    • http://lamekatus.com/uploads/ckeditor/files/46043356672.pdf
    • http://koala-al.com/d/files/lamosalajixizofomodaju.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gavimumeparazikabukabo.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d4adca03d758870fe08b643fa529980/51291683541.pdf
    • https://ph2020.org/FCKeditor/file/wonunubuzaso.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/12372985516.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+1.4+update+download+apk
    • 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_off0000da6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 16792 bytes
font_01_sfnt_off0000f281.bin
13166f1c50a6bfaa50bea1cd5ee9e89d94c9a1e735b79bbb8d5b19a066519f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 18372 bytes
font_02_sfnt_off0001223e.bin
b86cb663d686bdf0ef98bb1a4520355550495da0daf9ea70d00809f1a1844d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10820 bytes

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