Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3357a3aa6ad05d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-13 21:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7793139950b823b39a44a641bb6a2b98 SHA-1: 331facd8afce1684f429bd38bd10d13c4896d55b SHA-256: 0b3357a3aa6ad05da470037ffd502a72674c9a28bd017370a91d41b6630d73ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to 'synerhu.ru' and another to 'hinodanang.com' which is identified as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=raspberry+pi+android+tv+remote PDF link annotation
    • https://hinodanang.com/uploads/image/files/rasoka.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/57767971540.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wuvazonifaponodenanejiwa.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88395007456.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fikekolosulepol.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/81884447170.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/togelufovenutodole.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/92089982843.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb743d080---wefiditasewinuzitan.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rapasijewunitasus.pdfIn PDF document text
    • http://qdjshg.com/files/file/gazelonop.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/31550616582.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/tubaniriwat.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/48303192538.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/86963667002.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ec833a1824a9a36bfdeb60f0889e5a9a/37220850709.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/2235242659.pdfIn PDF document text
    • https://produse-zilan.ro/files/fokiroxofupivofofirisu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/30126103199.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/62737035253.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/nowosujojalefivaro.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040943197569.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36205130445.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 10872 bytes
SHA-256: c9831b8511e5cc7288001bb117613046917666c5cc36e0ca89c893e955993d8b
font_01_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 15428 bytes
SHA-256: 57494853c926600d4d97784f703d5f3fd8bfd65658f32c14b5a943475e302bc0

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