Malicious PDF — malware analysis report

Static analysis result for SHA-256 00590bcf6105e7ce…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 04:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96113841b07968911eb4507bcea0794 SHA-1: d63733a83372b726e2ccdb12e0e3fa6f4af8bde7 SHA-256: 00590bcf6105e7cec4e5a7ef7abf6d1b44102100ce3a32df8005d16ff5e67d5c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters for tracking, strongly suggests a phishing or scam campaign aimed at tricking users into downloading further malicious content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xyoaa.org/sites/default/files/files/36036231726.pdf
    • https://semangkabiji.com/contents/files/gitogeralozofumasedode.pdf
    • http://cafegreenwichvillage.com/uploads/files/munavav.pdf
    • http://kbcsisa.com/upload/fckeditor/file/vufur.pdf
    • http://mylivediamondinventory.com/uploads/files/zavudimidazorexilo.pdf
    • http://adacu.org/userfiles/file/20210908083838.pdf
    • https://swalaya.in/userfiles/file/3894618478.pdf
    • https://onecre.com/images/content/files/70951729000.pdf
    • https://lazerom.pro/media/file/wurawupaferixejom.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/76672109134.pdf
    • http://remont-etalon.ru/upload/files/zorija.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41778bbf0---43075472774.pdf
    • http://strandedtattoo.net/file/4344856400.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/92614667751.pdf
    • https://equator-maritime.com/userfiles/file/40527853128.pdf
    • https://ahreco.com/uploads/news_file/nopigajo.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc6a82f13---wosumebikalora.pdf
    • http://lidaoxc.com/upload/files/10356951496.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/73915203295.pdf
    • https://anitt.in/ckfinder/userfiles/files/97703384960.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/19517764816.pdf
    • http://cuboni.com/uploadfile/hong202109040054112930.pdf
    • http://snft.ro/media/file/43321273640.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+play+it+apk+for+pc
    • 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_off0000cecd.bin
8eebed63e533e90010357239aa3b2843625b91b606b08297c3ae9e1b98092510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 10604 bytes
font_01_sfnt_off0000e72a.bin
992228e0ed66ae68ab96d48f561081a6ca7c6feafff9ea1fa1b1e6b313d40e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 18276 bytes
font_02_sfnt_off00011683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11683 16792 bytes

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