Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34fb8aa2e3af90c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 01:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e10882322bc88123585db686aada9442 SHA-1: ced60ff00a2361e9f1066e3051b133cc31fddc72 SHA-256: d34fb8aa2e3af90cf26436d2c63f26c95299308e1a79ec50598903c7704fc467
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf6a28b80---zobilusenimuxojata.pdf In PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/kemixijixodor.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/38778840214.pdfIn PDF document text
    • https://mangallagn.com/images/file/15713450308.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/poliganekonugale.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109231218324598910fhx52epgsnd.pdfIn PDF document text
    • https://flyags.com/editorResources/file///likutojunarunepotakunuf.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210904_015919_180.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/kuxobo.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/tojijebadi.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909191110.pdfIn PDF document text
    • http://onlinevay.com/upload/files/22740275196.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/zenefawowavula.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/jinepinarenex.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/zolufiziwe.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/witulunefazepax.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161338a194494e---xefopazebadepive.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rigubapom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+de+thoth+pdfPDF link annotation
    • 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_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 10212 bytes
SHA-256: 6e4209c6528e8431e56e3c7c03219b10471be4910bf6994e4203084549c97672
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 20344 bytes
SHA-256: 5a996a25666f329916126d694889d19aa9c5228c053c4604171c46aa89165790

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