Malicious PDF — malware analysis report

Static analysis result for SHA-256 a869f4f55462aedd…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 05:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f94fe186648813b8575e391ecc48b7b SHA-1: e4614b7d94600c02d04c78132da387c71cbb520d SHA-256: a869f4f55462aeddc98f5a24f5991d7aff2be46155c449955b9ace0d31e02a75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://spellenindex.nl/images/uploads/78554598342.pdf
    • http://abw10thstreetne.com/uploads/files/bokezu.pdf
    • http://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdf
    • http://a899.net/userfiles/file/xesepev.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mogalotafojixo.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/31156352667.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-12/20210912070057719831.pdf
    • http://cornucopiafrederick.com/uploads/files/97576595333.pdf
    • http://digilit.ir/basefile/digilitir/files/21868643505.pdf
    • https://needlugs.com/userfiles/files/58242265306.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307885601641.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e5fe8dea54f3d471dc7ec634d70806dc/18541000012.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/21545580576.pdf
    • http://fixafilm.se/userfiles/file/36046193993.pdf
    • https://ubk-sad.de/azubi/userfiles/files/bepef.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/nikarowesoxuwidovotilavu.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6783a0234---refodi.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/figunesurisekavajixu.pdf
    • http://atomiccm.com/userfiles/files/55738364246.pdf
    • http://bettaletroom.com/file_media/file_image/file/bemegajabujawewunusej.pdf
    • https://agrando.cz/files/file/78023417131.pdf
    • https://nevisnews.com/userfiles/mutofonotib.pdf
    • https://szabobuszrendeles.hu/files/files/toxikujaku.pdf
    • http://szintai.hu/ckfinder/userfiles/files/gozopedafizeru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=guide+app+download+apk
    • 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_off0000d5c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 16792 bytes
font_01_sfnt_off0000edde.bin
9bab34ed31c5d063ed141a70d6fc0a363fc5c887394f6a02f2981dda437d06d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10336 bytes
font_02_sfnt_off00010550.bin
2db32f8a360add24e2eec91050fa49ff28a18c1daa9f4d6c0278acd85854ba3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 17232 bytes

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