Malicious PDF — malware analysis report

Static analysis result for SHA-256 987dbb966637369d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 06:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55cd48f52c19f4144af2c2c93de04fe5 SHA-1: c8a3045914b3fb6ee5fb6616d7593f65d0c53d8d SHA-256: 987dbb966637369d4ff5180f77b9097593ffc4edd666b45b6cec013821503630
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 trojan. Heuristics indicate it functions as a link farm with a high density of external URIs, many hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb328477c3---mokisejimevakitularo.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/95528132908.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/84905538861.pdfIn PDF document text
    • https://jobtiara.com/files/files/juvot.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81011647005.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ranojar.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/74883527072.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/6959396512.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/wamuferepoj.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2862d88ed843bc631a75737ecec8d739/50576686392.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///53641887979.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210904133709.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/jupaxonolibirade.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/32920063566.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/dobabenozerulagolamozoda.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/83963475947.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/88788917006.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/97787101215.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906232130.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/davamojonolenewut.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/78969730178.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/rorogarabuvuni.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/91948886997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=google+play+movies+on+amazon+fire+tvPDF 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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10980 bytes
SHA-256: c1319b6b88b4d03adc17bcbac9c78135e11fefa18a057e0a72c744eb49400130
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 18164 bytes
SHA-256: 0e414ab0184b2eb630d1fb27c8d5dff78ae8eb9db59fec9c9828758c4ff33b21
font_02_sfnt_off00013abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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