Malicious PDF — malware analysis report

Static analysis result for SHA-256 d086aa573b6143e0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 13:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d295e9f9cf90f20833196d46bd2e7be8 SHA-1: 69a5a8df12d4dcdf236a76164206826a4162b06b SHA-256: d086aa573b6143e002cc646fd5359b546bd1e401cf8634515e6d31eca23d63d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with attempts to redirect users to potentially harmful websites.

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://oniceh.ru/uplcv?utm_term=the+sims+apk+mobile PDF link annotation
    • http://firegallery.ru/img/upload/foruvur.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/bipufesaregomawokedibunud.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/78969341790.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/23674557824.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/lusobajenodu.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/xebidatonasofadivusofoger.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/94722211868.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/lewugoxuxunoxeji.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vobutozeturubetakelazep.pdfIn PDF document text
    • http://client.diffuse.info/files/sozuradovodonopi.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/zopivu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092817065573499.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4646c1f62f9c32afe90b29b0a686deeb/68395121638.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210930162455873.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/miwaf.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zelopatapavojave.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/75893330086.pdfIn PDF document text
    • http://teplospectr.ru/images/files/97995127715.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071758449833.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa85b6cdbb---53846692172.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/togifasesitez.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/80630178162.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/16209657511.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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 10412 bytes
SHA-256: 7f4ce8d2b94d22976174b96cc1f034034c731125ca515ff31cf44a022ed3890f
font_02_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 15292 bytes
SHA-256: c7a683d3610c700e349e194087fccfbf09edce3627e21839415de910e24f0380

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