Malicious PDF — malware analysis report

Static analysis result for SHA-256 1898bda9391e017d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 01:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ece295792e1b1e96775b3b54f978141 SHA-1: 001e153e9c10636e03b82347dd34f6ca052daec0 SHA-256: 1898bda9391e017d93574e845927c89fabe4d8e52e0ff90cca304c9610b6d8f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--9w3b270a7kf.kr/data/editor/file/43641916775.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/12530886046.pdf
    • http://zanethompson.com/userfiles/file/75696880829.pdf
    • http://gancza.pl/userfiles/file/21102087132.pdf
    • http://tech-in.info/bramy/userfiles/file/pejoxisizuligugira.pdf
    • http://daisin1977.com/js/upload/files/77629087264.pdf
    • https://mamap.in/ci/userfiles/files/13825502402.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb139830f---vomari.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/91932252392.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/monaweruzujixomupebiras.pdf
    • https://medbillings.us/lightspeedweb1/file/fudalobe.pdf
    • http://air-separation-supplier.com/d/files/jumavuzubesurolaruza.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/daxojejirikijukutitegogap.pdf
    • http://ptairsupply.com/userfiles/file/92130928103.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/vogogefijikeza.pdf
    • http://quatanggiabao.com/images/uploads/files/18981198493.pdf
    • https://indiantiffin4me.com/nbloom/fckuploads/file/61414781107.pdf
    • http://tdvvietnam.vn/webroot/img/files/jomanapemasol.pdf
    • https://urbanshapes.in/userfiles/file/53110381943.pdf
    • http://nataliashishkina.com/userfiles/file/sijavalafigeg.pdf
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/56120398254.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ccleaner+pro+apk+free+download+for+pc
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 16792 bytes
font_01_sfnt_off0000f610.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 1680 bytes
font_02_sfnt_off0000fe08.bin
65abae3adf4b8b1f3d1920f06c771c28bb86abee38d03ae4381aadb3803a1097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 19364 bytes
font_03_sfnt_off0001306a.bin
4026a2036cad63e5830aae08632adb82a388e2fe63c2ab8eb03c4aeb0595e88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 10464 bytes

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