Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cc9551634f0975…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 02:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e150a7672bc6f6a789e8b6d004cce40 SHA-1: 433195310926dc3c45a52876debd15563d62a375 SHA-256: a8cc9551634f09759fddf769512361f4f3d3d85dd6ec3df2378b4d5f5267e80a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or spamming operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is designed to host many links, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=watch+love+island+usa+for+free
    • http://zoldjogsi.hu/uploads/files/49869148455.pdf
    • http://jatechkj.pl/upload/fck/file/bewido.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dbb42e99b9faf10f4040dda97e5effda/bozisozejewovu.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/manirujuravosopuxe.pdf
    • http://transportdiverse.com/uploads/files/zalibinutejuwaloxesuxem.pdf
    • https://0955205219.jwa.tw/userfiles/files/84374333726.pdf
    • http://www.s4b.nl/upload/files/27703028033.pdf
    • http://maychamsocda.vn/images/userfiles/file/70880275487.pdf
    • http://foto-preiss.at/upload_files/files/47205458883.pdf
    • https://senarathgroup.lk/assets/media/file/9044030850.pdf
    • http://tcyy88.com/userfiles/file/2021091621560273499.pdf
    • http://chukysovin.com/img-svc/files/jajilozale.pdf
    • http://brezov-gaj.si/uporabnik/file/notanirukuzi.pdf
    • https://franchiseharbor.com/files/files/robepegogedafag.pdf
    • http://ayurvedicclinic.org/userfiles/file/gikiw.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/konosifizesenosipubula.pdf
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/9050161234.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nufujitemubavedud.pdf
    • http://mcutech.net/upload/2021/09/file/16306894821507507709.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nojuzuveturilizo.pdf
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdf
    • https://valve-toho.com/userfiles/file/nedegexajat.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9874e4d6---rimoleto.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://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_off0000d9f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 16792 bytes
font_01_sfnt_off0000f20f.bin
22fa99453dd7e57ad7fcb4b2464ad0eb94f61f127dc3e8d6cc45be1759cb753d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10732 bytes
font_02_sfnt_off00010ab5.bin
82ecf14a53a55afa05a21089995524de30d8ab09381d90c240348ddcbe5c6fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 17996 bytes

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