Malicious PDF — malware analysis report

Static analysis result for SHA-256 7571911b371bd49f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 20:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd8514517103e259598ae8539b096dc9 SHA-1: 311dc880017d9b6013fed88291cd18b30376cffa SHA-256: 7571911b371bd49fbac92a3245054dc616232a1087d6beb1337fe5d8cbac98f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d361c449f---sijupokesoru.pdf
    • http://siamsnail.com/media/userfiles/files/706878558.pdf
    • https://akapacha.com/userfiles/file/32196308332.pdf
    • http://jyotiacademicpress.org/uploads/file/voduxuser.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/wuzefifujib.pdf
    • http://www.beautyvogue.ch/Files/file/98634538287.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bsitlbfj8p3s6bgqcc38uon6ei/76252346284.pdf
    • https://selispin.com/calisma2/files/uploads/wunugofizevimabofede.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/33944937028.pdf
    • https://milorem-service.ru/userfiles/file/8726735389.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/badumuzegizina.pdf
    • http://bhartiyambeohari.in/userfiles/file/35174482870.pdf
    • http://kool-house.com/upload/editor/file/33184724690.pdf
    • http://splogservice.ru/content/file/ririvozetarivifubazozu.pdf
    • http://bagiez.de/userfiles/file/91824871030.pdf
    • http://energo-market.ru/sadm_files/7594300235.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/rexalovaxabexamopatetefep.pdf
    • https://brakos.it/file/7861700622.pdf
    • http://iccjsc.com/images/uploads/files/pozemabudibeme.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021951356303490.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/gonifa.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/86874899973.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nakuvovejofudif.pdf
    • http://polyalpan.hu/_user/file/fowevesadanumoxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manje+bistre+full+movie+download
    • 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_off0000c383.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
font_01_sfnt_off0000db95.bin
18575edf1bf2e53b106e89679120814963064506d03b1becd4ca810c95cde977		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 17324 bytes
font_02_sfnt_off00010894.bin
126ee1d714413ee4a730e54b92c4973f1abe41a7cc7d3c4598424eb233812f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11032 bytes

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