Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15dd4a29336040b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 00:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c55e53a336d745fc7bd2505e8b40d3a SHA-1: de2fd65cf52c699676aadb8f6a54ff4edffeec54 SHA-256: e15dd4a29336040b43b506759be73a58afecca9930ac8187776cbdac916fbcc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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=android+rename+device PDF link annotation
    • http://mousike.it/img_ins/files/pibidikoxoxiduna.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/fuluvuwe.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/sitebirilitibewuvirili.pdfIn PDF document text
    • https://rais.bg/uploads/file/18630915977.pdfIn PDF document text
    • http://mylodge-naoshima.com/kuviwisositab.pdfIn PDF document text
    • http://zerosquareonline.com/file/55522482072.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///6085486311.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8a883f3d5b4d8fd310f7424cad77ce4a/63114962927.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/lakediwo.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/82349590282.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/bixojulatugetara.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/rutupojilusupun.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/36882169535.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/satopesagutipuvotakiladef.pdfIn PDF document text
    • http://xfswchem.com/upload/files/jenuxizus.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dede30dc---63979161182.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/3224086317.pdfIn PDF document text
    • https://tcremich.lu/files/files/fujojijapevatojitusizosi.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/17205345593.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/79697601730.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/tipolumajiziliwuza.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/fitowowipibafakot.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bujitogasoganeveluwoko.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/jebekipevobufemoluzaz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10264 bytes
SHA-256: 50ad62e24675ec40af5c98aa9092c65b04ba2acdda2d054240e20bdbc9675ab0
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 17764 bytes
SHA-256: b1bc4044acc449582c3a4fcc8d9dfced397a92fddd148157d467b8dfa84c5733

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