Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a9f55ffd8826b8…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 23:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7527452c8c0889f90d7871c313fc9bf SHA-1: c593982e9270503ad9027cfb93b6e2e374f6a460 SHA-256: b9a9f55ffd8826b83fc0533071d8d3b636f7b8cd856246d33e386f870d62d421
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It employs a common social engineering tactic by presenting itself as a password-protected archive or document, instructing the user to download a new file to bypass the supposed protection. This is a typical lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a2003019c---vezujefoxa.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d21c805e9---52779120365.pdf
    • http://amandatravel.com/userfiles/file/jigogarur.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/07jgu9n4i3hcekf1moj3i2csa6/16866648177.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb306ab154---67552968007.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af43bbbdb9---mapujamosefi.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8c08cc12---letemop.pdf
    • http://apvn.info/userfiles/file/51441934406.pdf
    • http://arcomproltd.com/userfiles/file/61441184241.pdf
    • https://nada70.org/userfiles/file/bovefomuzezukeku.pdf
    • http://bright-mineral.com/uploadfile/file/2021052415594586.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11799a34d---besonafuxu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480cce1633---riragodozemozuzozawig.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2c089931---86961784998.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2f0586600ac041f9b2e7bfdc737b2f29/38206595578.pdf
    • https://creteservices.com/FCKeditor/userimages/file/66676032818.pdf
    • http://sy-smile.com/upload/files/sarogofokajotexepe.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kfd6ksemb9hamtvok4r95d1lg0/talurave.pdf
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/kusiwi.pdf
    • https://ajansnigde.com/resimler/files/51473001248.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098aab7c158d---53066587289.pdf
    • https://autotrans911.com/thread/admin/uploads/file/nosusoburuwito.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cannot+print+password+protected+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_off0000fbfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 16792 bytes
font_01_sfnt_off00011413.bin
4d768d9e579735638120f0fae1759e68acc73b1bd606710f16f0aa5cb58cda11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 10684 bytes
font_02_sfnt_off00012cd0.bin
60c757f2650b9259983d79a44c9e0d51a8850cf41d140d30d3c8baac3a132959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 17136 bytes

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