Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cb0c6486c89a40…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 06:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11cb374af1acbb092ebcaa7c79fb9d41 SHA-1: 614e26a0e7b3110be030758449aeb759eeb8b3e7 SHA-256: 35cb0c6486c89a4016571036d18495ef868f116f35150c828f5c6b8a2e91d959
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=ratio+and+proportion+basic
    • http://banghetretruc.com/media/ftp/file/86158887895.pdf
    • http://www.slappedtogether.com/editoruploadfiles/file/nifuzofugajekuxosaza.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb55c88d9c34572f5277c804a5460850/zoxedenigutusasidonituge.pdf
    • http://tradotel-riviera.com/file/14030367963.pdf
    • https://needlugs.com/userfiles/files/2866342743.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210911_BA86B1EEA731AAA3.pdf
    • http://klawiatury-foliowe.pl/_data/file/44675613835.pdf
    • https://orcasproje.com/userfiles/file/xedapen.pdf
    • http://tahi.hu/ckfinder/userfiles/files/kuxuzunamufazeba.pdf
    • http://szm.hu/userfiles/file/wekotelusonebodixatode.pdf
    • https://accounting789.com/ThImg/file/wezexokojokokilod.pdf
    • https://portalbime.com/UploadedFiles/New/file/bovamirigur.pdf
    • http://heyumpnd.com/userfiles/file///motixuduxinolulepamekukom.pdf
    • https://7mark3t2-7aya.com/contents/files/zefewagukudusale.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/89659564881.pdf
    • http://iuoooo.com/filespath/files/20210916120324.pdf
    • http://www.armstrongre.com/files/files/kuroboguvilif.pdf
    • http://akinmedical.com/uploads/file/14409716552.pdf
    • https://pleasanton.com/wysiwygfiles/file/bekemolefo.pdf
    • http://tpokebar.com/uploads/files/98341734623.pdf
    • http://aorganboys.handyfriendship.com/upload/files/66418788990.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8b735210bb008b10927ce15d13fefc5c/nunireruwipolevedojukelom.pdf
    • https://russiancosta.ru/ckfinder/userfiles/files/19079721418.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_off0000b05e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 16792 bytes
font_01_sfnt_off0000c875.bin
847f2dec3d5c9fbe5c2166aeb7ea1cfce785510ef0850792e0f989056884dddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 10516 bytes
font_02_sfnt_off0000e045.bin
1216eb38e93c5390da6aadb9ec631a31df314528d7f3b7cb5305359b69edc7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 15036 bytes

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