Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f708e764928d608…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 00:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392827b9dfd3e5ae304e770e822ad824 SHA-1: c15993989aace965333eac3531a3e74199704394 SHA-256: 6f708e764928d608362b0d4b15c33c479f1b91fc4316f4bb666b574ec57918dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://infrive.ru/uplcv?utm_term=farming+simulator+20+mod+apk+download+for+android
    • http://think6.net/ckfinder/userfiles/files/20210910191832.pdf
    • http://detikakdeti.ru/img/file/43912706708.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/lufasudixatewoseliro.pdf
    • http://centroolosprato.it/userfiles/files/vizobo.pdf
    • http://artio.pl/files/files/50122976776.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_561F7F2366342EEA.pdf
    • http://tdjl.com/uploadfile/file///2021091010101983.pdf
    • http://hani-bee.com/userfiles/files/98566246520.pdf
    • http://poultech.net/d/files/sidizalexipato.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa60c50e1---wijewosesigigid.pdf
    • http://csc-027.com/userfiles/file/20210928205637_cl4rjs.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613407b598bbc---72677366411.pdf
    • http://eortak.com/img/fck_temp/file/60142176120.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/63420127428.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/wafubi.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/97287546970.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/loteg.pdf
    • https://asiapharma.la/files/files/91143704953.pdf
    • http://homelife-superstars.com/image/files/pewemux.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/85213492877.pdf
    • https://niboparis.com/upload/fckeditor/files/winelugokisefifun.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_off0000ade5.bin
f5fc145e4130c97441fb1b1142a30fc2b6d513ddc461c2e58a0f6f6f75f0d06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE5 11204 bytes
font_01_sfnt_off0000c7fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 16792 bytes
font_02_sfnt_off0000e00d.bin
b82df8cf6e36ca0a9cf368110673e2aed1256f525071bf9a2956d9db382e23c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 14528 bytes

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