Malicious PDF — malware analysis report

Static analysis result for SHA-256 1815e6d4ca62b699…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 14:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19cb91793ef3116a5de1043403f240e5 SHA-1: 9e0111b9c7100f7e11910c6be5afb5dfe40f1938 SHA-256: 1815e6d4ca62b69967874bdb67fe2aed99036d1124b47bcdd555ec36d988a5aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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 https://inwebjor.ru/uplcv?utm_term=best+online+adventure+games+for+android
    • http://sangiorgioautoservizi.com/userfiles/files/keladedejepurotuxuso.pdf
    • https://nieruchomoscikomercyjne.co/files/file/667311895.pdf
    • http://trumoi-khutrung.com/upload/files/28689433089.pdf
    • https://twr1115.net/files/fckeditor/file/monezubuludul.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/kipetajuwufekavutimekub.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60acdb1ab---sumevezubenevoj.pdf
    • http://wannawwannie.pl/userfiles/file/mojudaf.pdf
    • https://giorgiosantinelli.it/file/tixodul.pdf
    • https://riminabda.sk/userfiles/file/gabavifitixejo.pdf
    • http://bk-plus.at/userfiles/files/1356660807.pdf
    • https://yoimart.com/upload/file/20210907110625.pdf
    • http://vhktn.at/images/content/files/jedarilixumoj.pdf
    • https://www.l-games.jp/js/ckfinder/userfiles/files/8037332510.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/jevog.pdf
    • https://fotografski-studio.kost.si/userfiles/file/wigijivusesolepuvutoga.pdf
    • http://ahnil.com/userData/board/file/sevobozemobefevotirexi.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/masowigabakibonuzige.pdf
    • http://clinical-pain.com/pds/userfiles/files/36469630632.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/84172791043.pdf
    • http://gavionescodeinsa.com/userfiles/16844200546.pdf
    • https://sharedsynergy.com/userfiles/file/20259032119.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/koralureser.pdf
    • https://alternativecarrepair.nl/userfiles/file/rerufilijudiret.pdf
    • http://sunnyten.net/userData/board/file/220627439.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/eac4f9f8dff33de0f0c481d4f2f35bfb/36785136779.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xuluxusirusuxipeguputa.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_off0000d80a.bin
875b0009192345afbbab1d8b1f7189dc82056b11671fdd2cfe154b7087b81c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 17172 bytes
font_01_sfnt_off0001049e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
font_02_sfnt_off00011cb5.bin
81bc244d7e3b90e763c329c1dabf2e9e983147490076bf02203f81d5adf090d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 10916 bytes

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