Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1b7eb8d3612582…

MALICIOUS

PDF

96.2 KB Created: 2021-07-03 18:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de2fbe19e6507e7c2b0023ddff17b9f0 SHA-1: 7a24a64573bcb8d01f6760904e06c594a2d8cfea SHA-256: 4f1b7eb8d3612582af8de36c02bf7fce86de6e66b18440ac4bb3358fcbf841a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. While no document body text was extracted, the presence of embedded URLs and the PDF structure suggest it is intended to lure users to malicious sites or deliver further malware. The wkhtmltopdf authoring application is unusual for a malicious PDF, but the overall indicators point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qk0th27flafgjq5rdk7iok3l86/76700032731.pdf
    • http://myflora888.com/ck_files/files/81984281410.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9b02f7aa---4743479966.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54e8f00ba---wetufitoletuxuxigi.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6cbb44386---nelemuvusabiguzex.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/josesexewem.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4aa8802c9effa6a0acc1c91c4b7bdaf8/40770371329.pdf
    • http://inarchengineering.it/userfiles/files/83217839657.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b133a5c4b---xabozi.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf1bdd249---49760673009.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/h90ht1merjo0pp4rbtsptq263b/44875974959.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/wedagiwef.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c203225edea91d7f529ae403ef415635/9591398917.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3ac5363b---rewenosotem.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/jonefegelanoburuvaki.pdf
    • http://vizesblokk.hu/files/file/60694648268.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6cdf530---66217279930.pdf
    • http://universe-micro.com/upload/files/20210623_093300.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4fb34e6f71b5fbf93609d175a2fbd7d6/pagisafiwekiges.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30b189f0b---74084549586.pdf
    • https://parlagame.com/calisma2/files/uploads/dutawaganir.pdf
    • http://jtour.vn/userfiles/file/kadogekipesosatajebi.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/i5dsbve0m66aisg7dqrn7t7mid/tosiwidefomiduvemenos.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4fa10ad9589dc693e01dd1b52de976e2/sutefejeguxuregalumu.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608036d504653---tejorivaxefobikiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=80s+feathered+hair+male
    • 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_off00011636.bin
6ac180bb6964cd978c4eca18c08b5b3f083f4a7da009166c5a3f099c7f2a2b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 17408 bytes
font_01_sfnt_off000142fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 16792 bytes
font_02_sfnt_off00015b12.bin
0f0ce5e24d4da276a1ab8a9a9c42f51edd38b7c777779412dcf3606329e8eed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B12 10628 bytes

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