Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c3d2197d4c2313…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 06:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c632955bccdc3228077ba2a4ad508beb SHA-1: 42a5ba4fc1c8644712d48cac0a69834f1f11c590 SHA-256: a9c3d2197d4c2313b6708deb4e81ef4eb908937a73363001284e90b482a614a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are linked to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=apps+like+omegle+for+android
    • http://adria-ex.com/images/blog/file/77057845629.pdf
    • http://hongphuc.vn/userfiles/file/24515873389.pdf
    • https://youkuvpn.com/upload/files/guregevoxefuxigekin.pdf
    • http://hytechcommunications.com/userfiles/file/zedukimumajuguvezebiwud.pdf
    • https://nomortiga.com/contents/files/97595764307.pdf
    • http://garagehayashi.com/js/upload/files/47112860153.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_17_08_59_5554.pdf
    • http://doubler-son-capital.com/photos/files/1854177601.pdf
    • https://lanjutpt1.com/contents/files/16096162855.pdf
    • https://chung-pei.com/userfiles/file/64852689927.pdf
    • http://fszhenjia.com/upfolder/e/files/20210927075257.pdf
    • http://spielundlicht.de/content_provider/documents/files/latiwivelorasasokivolir.pdf
    • https://people11people.com/uploads/File/80254588676.pdf
    • http://thebookmarkcafe.com/uploads/files/fufer.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/48842695621.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/midoxufezejobawef.pdf
    • http://4998horo.gmmwireless.com/contents/files/dilopomefigipax.pdf
    • https://noihoithanhtuan.com/media/ftp/file/86564740543.pdf
    • https://keluargamimpi.com/contents/files/lavisizalave.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/34303366041.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/sitakuzarotufor.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/18148392047.pdf
    • https://pmsp-me.com/userfiles/files/gafewamex.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/retegulajibujanavosufa.pdf
    • http://daydeothe.vn/rich_editor/file/gelovarisagaxelaj.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_off0000b16e.bin
6ace34b442fb9597a5b1304551c9893b46c94005e35805f498192787a2dbc577		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 10816 bytes
font_01_sfnt_off0000ca24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16792 bytes
font_02_sfnt_off0000e236.bin
20e716016f61cac769cef20d3ea4ef1072f29d5f87e779beef0260b69699d3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 15464 bytes

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