Malicious PDF — malware analysis report

Static analysis result for SHA-256 310fe9e0fe9753a0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 572dc639f2bc25c99318d89269722a59 SHA-1: 7ae0a134981d73841aef2f7e535b58e272b9a6be SHA-256: 310fe9e0fe9753a03d1364b502062e1d67ef9b9067cbfed7ac0d089fe68adbe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution. While no scripts were directly extracted, the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://cesarrodarte.com/userfiles/file/54133867654.pdf
    • http://ipayon.com/root/FCKeditor/file/80321232590.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/nevobijuloxip.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/kikogapabezidap.pdf
    • https://benqmusicworkshop.com/fupload/file/kizaf.pdf
    • http://mywayrtk.org/userfiles/file/fepexosejaz.pdf
    • http://educasters.co/ckfinder/userfiles/files/jirawozix.pdf
    • http://ieltsadd.ir/cache/fck_files/file/80851703436.pdf
    • http://www.blueoak.fr/image/file/miloxegemadewuwoloxolem.pdf
    • http://hnsunnyfood.com/d/files/72096646516.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901111245.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161341beb7d286---nopab.pdf
    • https://mountmoriahcamp.com/media/45771121556.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/21610cdd524576e97af5d42ac4d44355/zenenaderu.pdf
    • https://rwd.webseo.tw/upload/files/38060759613.pdf
    • https://mcsfood.com/images/file/99411913011.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34077133242.pdf
    • https://guruamardaspublicschool.com/userfiles/files/kopila.pdf
    • http://a2hgghk.handylover.com/upload/files/wigazevefavezakasiwijad.pdf
    • http://kite-surf.sk/files/91348629400.pdf
    • https://ecoledesgourmets.com/userfiles/file/59009438330.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/sovularuvomanabibobedaxuw.pdf
    • http://czdashan.cn/uploadfile/file/2021090523493373499.pdf
    • http://auburn-properties.com/userfiles/files/zenipenelonidonitawokon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rupaul+drag+race+holland+online
    • 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_off0000e931.bin
c0ea3c154c1e08fdb6b9fe491e4144708aa4d5c7c2f984016061f6d309f2aa75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 18196 bytes
font_01_sfnt_off0001187b.bin
e0aa99f03ed967e05a6a4073697f556dc316d5987d34c86adfe82fd1b9e7644b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10672 bytes
font_02_sfnt_off00013090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes

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