Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4be10ae43819b3…

MALICIOUS

PDF

93.0 KB Created: 2021-09-24 10:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aed9727e62217873af3865a7e23f88c SHA-1: 398ec1d82decefa766726593599cb7103b9116b5 SHA-256: 8a4be10ae43819b3258e8731c2d33a467eb4e03b761c25e49c711d72745b98bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=free+instagram+followers+generator PDF link annotation
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/13669855302.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/73403848206.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/33166586512.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/1037437460.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pamowodesufiranibopopofeg.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/31414418554.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/92751436865.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a23be56fb9---80832732411.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/sepobafokil.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/vafivivikojifaxug.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/72638431134.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fadetomonobigaximanikelot.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/37848459715.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/58495414253.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/moteburidudizatawikilu.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/75539301021.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aa403849---wuwamoduwig.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/76438606272.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/kifafojexazo.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_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10620 bytes
SHA-256: 35583f9f7ee68a69760ac8b30190bf9c5f57e168781aebe79077dc4b5811c06e
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 18416 bytes
SHA-256: aa0c29c56b0238743911b0b0bae4d9e7166259e0b7e9817467022eb33848e6ae

Open this report in the interactive analyzer, or submit your own file for analysis.