Malicious PDF — malware analysis report

Static analysis result for SHA-256 63447fe35b5c9345…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 22:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c1da3c72e273afa79ee6c7a939acd24d SHA-1: 4385566f0dbdcae45818ff9f7340e05163b30d7f SHA-256: 63447fe35b5c9345512c6c4e0ccd41f481e034a12d0085fe70f5b2dd6eb84463
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many of which point to disposable domains and are structured to appear as file downloads, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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=god+of+war+1+ps2 PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/11969904194.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/86700705465.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/dajisej.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/bopuwakitijuwef.pdfIn PDF document text
    • https://profm.hu/files/file/97602808482.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/15942229876.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/39892341782.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/pidek.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/fidagileve.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/nibasenudelefamafiriw.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/29625430645.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/14228472693.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/22001038934.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/33768316537.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xagin.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/80339215741.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/26839387979.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907224958.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/91430319951.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/5625776348.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zipinerofigow.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/72622538264.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/bumepa.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210926075539_108079799.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109242301102138.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2c1cb8422a3ba6d0704f3b77765130ad/23922737455.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/nutivufuxose.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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 15976 bytes
SHA-256: 1c9dfdc6e6e00db42f0769a242f932496c1e93c6e8bb53b0633ff057002a0210
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 10316 bytes
SHA-256: 20571673685148344f75fe0471dbf894dd4a6581833a84d549cfad78c0504355
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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