Malicious PDF — malware analysis report

Static analysis result for SHA-256 da139038bcc8526c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 19:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80d49d343d8281bc4d26a733b7020564 SHA-1: b1dd58efff374a501c39a3256b115fccca960f4d SHA-256: da139038bcc8526cb9c7a9390139b4f6f06daf925c586aa1fc1f3dd5bf609811
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains an embedded URI pointing to 'synerhu.ru', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the ClamAV detection (Pdf.Phishing.Trojan) suggest the document's purpose is to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=foods+that+increase+uric+acid+levels+in+the+body
    • http://alphasigmaoverseas.com/userfiles/file/ronis.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608688e2bc7b1---42948211038.pdf
    • http://unipsyclinic.com/userfiles/file/20210515013807.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70ab35719---60216873495.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da1edd1ed---58403372958.pdf
    • http://dajuicebarus.com/uploads/files/xegovorenodadi.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607244af393c1---30230854884.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3338ce21a---26864128777.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e300e363---63455213425.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/2rg3vihhd1ovq2vchuk3dkas3k/wekemipu.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f547875783---35022131813.pdf
    • https://fruzsiflame.hu/userfiles/file/28279465120.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160913b9e79579---59139188224.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/48768785824.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dc270f6f7a7beb95f188deb2644b7c77/jilojezex.pdf
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/pabebagapuvimuso.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/58de1b2ac086b784c619fd6b0868bef6/41690348160.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd746cd70---41330229217.pdf
    • http://anandtouristcorporation.com/uploads/72991390654.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c411468d601---37129440222.pdf
    • http://superfishinglewood.com/uploads/files/titonevilubunosex.pdf
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/gosawu.pdf
    • http://balogmihaly.hu/UserFiles/file/17802687369.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_off0000ed28.bin
e1219778094e1fdc68fe3ad532243556b2054010ea4ea806c153fa1aa7132127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10864 bytes
font_01_sfnt_off0001063a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
font_02_sfnt_off00011e4c.bin
7a081faf6302fb602c493a519304cbfbc346c461d82597f46596bb6591160850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 19036 bytes

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