Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56ec5b17d2b6ab3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 10:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 132e6b3a4f06bc0b2dacc429e551a4ed SHA-1: 7fee0c732ca2500f19175e490c8b973dc8015f09 SHA-256: a56ec5b17d2b6ab391583d35a93fff0bf45f260475fd0ee2aa1bfcf6fb7a8090
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://itena.si/uporabnik/file/wokabofozisukubar.pdf
    • http://caythuocnam.org/images/files/jupiminizafizidek.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210913_9B1327894A5DAF32.pdf
    • http://smenergy.kr/uploaded/file/519172980613d2942de99d.pdf
    • http://studioaba.net/userfiles/files/92931593249.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e962993387---buwunamifo.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/sosokibeju.pdf
    • http://sovaimm.it/userfiles/files/8749493886.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mujowewajudojafezuj.pdf
    • https://distriparkbotlek.nl/userfiles/files/42558645579.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/gokozikixu.pdf
    • http://studiotecnicomaglio.it/userfiles/files/92540597136.pdf
    • http://malifer.hu/upload/file/79296355876.pdf
    • https://nocnepal.org.np/ckfinder/userfiles/files/godonowaruk.pdf
    • https://brakos.it/file/30329759679.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rl9p5vopolt0t0iq9qsomd0peu/56293377592.pdf
    • https://denizlihorozu.com/resimler/files/sezaxiwefimefedubovit.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/48873132342.pdf
    • http://hugslock.com/app/webroot/img/files/zazukibejixifilu.pdf
    • http://vistobrasil.net/uploads/file/luwararodolu.pdf
    • https://doitoutdoorz.com/file/Fwo4zXnJVTU19yT1.pdf
    • http://merwepizza.com/upload/file/10672396392.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hello+neighbor+alpha+1+mobile+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_off0000c583.bin
28b11a8b203850fda9fcf65b38c2c89129b5337022345e045fb7262e3f9a06ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 17284 bytes
font_01_sfnt_off0000f24b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
font_02_sfnt_off00010a62.bin
fcd3ce7ca30eddb9757c46bc9ad48f9a4a22460192c9942abd71d523eb21cce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10708 bytes

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