Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fac233c9952ed5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 21:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c1261108492f7ca408378b39718405 SHA-1: eee68c595aa92b82cc3c94d88aadfe3199bbc25a SHA-256: 41fac233c9952ed5665229c5947d47e123fd411e69dd5d255ddf3773d0fb1536
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, identified by the PDF_JS heuristic and ML_NYX_PDF_MALICIOUS classification. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the numerous URLs present in the file. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb39555588d---92136160880.pdf
    • https://diedacorporation.net/freesiafiles/file/24623598094.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/08a88e21fb457b5e9e126da6e2187129/15037109059.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e751888f---sezuturokelekoviwesagid.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/57020437654.pdf
    • http://alliance-ic.ru/uploads/file/zijew.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453cd7eab4---2976159302.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/708a8d5d39b07da1ca541d281d0733cb/tefoxusegas.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0v4oj2js8fvb3211a1rivg3ccr/2300555829.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095a7bdd703e---rilizodod.pdf
    • http://alimentosldm.com/userfiles/file/sotanedejusimopogi.pdf
    • https://sinhadventure.com/uploads/file/lumak.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f06047ac3---fitikilisadapesow.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/27106e3bf90824dd006d186635dd81de/43368500365.pdf
    • http://hotspot-usa.com/js/upload/files/dawugizatunodilawixu.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e81642775b2965422ba47d4532634353/dogakozozofomimoxo.pdf
    • http://ruresept.ru/files/file/45026421518.pdf
    • https://secolink.sk/userfiles/file/senaluno.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/45763528166.pdf
    • http://driver-jazda.pl/upload/file/27339682739.pdf
    • https://chezgregoire.fr/userfiles/xolalofefudijufapurof.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f5d31451---safix.pdf
    • http://vizit-k.net/uploads/editor/files/dotorapozagurota.pdf
    • http://changrung.com/ckfinder/userfiles/files/71727208979.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2ad114ba96357b8e57fa6800928f67aa/lizaxe.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0a175f1d57051955f99ed7dc99c0d63d/36859417587.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ded55b169a5---7646891970.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=series+using+sigma+notation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba8.bin
dfb8915adf39f7793f1cc70cd123d57939f97c84e0acfdae2381163ca74dacdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 16848 bytes
font_01_sfnt_off00010799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
font_02_sfnt_off00011fb0.bin
5a7cfe71cb43cc196303178ec0762e0dfc1bc7bb130fdab48e32da57c83ca630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 10580 bytes
font_03_sfnt_off000137d2.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 16084 bytes

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