Malicious PDF — malware analysis report

Static analysis result for SHA-256 5babe11e9f05c0c8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 17:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: badff7b9337992322b7b794f75fda6be SHA-1: 2bfc7eeff94f6d828d479256f1f34b71f0b638a2 SHA-256: 5babe11e9f05c0c873ff43fe1007d24ef119132e9be3c736c145a522416bb8ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timebymtm.com/upload/files/5898150122.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/gamiponulewokugivuwepim.pdf
    • https://businesslife.com/content/file/26597429630.pdf
    • http://tnslib.su/userfiles/files/26931252938.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/buxawukob.pdf
    • http://tokyo-sanritsu.com/userfiles/file/45633865348.pdf
    • http://erainbowrealty.com/userfiles/file/90970241825.pdf
    • http://automsystem.com/UploadFile/file/20210909014910447.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeea3b804c---52885755543.pdf
    • http://autohondl.cz/userfiles/file/63582461459.pdf
    • http://xn--lv0az70cxar.tw/uploads/files/202109020548403885.pdf
    • http://teenmag.cz/userfiles/file/fowoki.pdf
    • https://kimcert.net/E/file/daxowuwaxutunimokomot.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090313114173499.pdf
    • http://zzfcw.com/file/fkimg/file/36711592332.pdf
    • http://fermobkorea.com/userfiles/file/20210905001437.pdf
    • https://propiedades.net/ckfinder/userfiles/files/35156512248.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/15158382681.pdf
    • http://belean.pl/userfiles/file/xumexebanovobebadafo.pdf
    • http://viethanit.vn/hinhanh/file/53016559769.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/24310148793.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/36497652680.pdf
    • http://flyingkirin.com/uploadfiles/file/05021804235.pdf
    • http://benetalent.com/upload/files/wuxoxamevusudamapusi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=erwin+kreyszig+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_off0000da47.bin
477ddfa91b8af05b7c898b2dfe3670e47672628c4ea083de47433231156dbd62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 19188 bytes
font_01_sfnt_off00010b40.bin
855cdb6933d28cbfcd1664456f70ecb7b3b353e6706bf366cf8d5fe11cb47c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10584 bytes
font_02_sfnt_off00012369.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes

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