Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd76f962e20d1a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 02:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b80e8f2a323ab5be4a40c1aa14ba93ee SHA-1: 7017b6f392f14c2725af6cb7296fe17e8264a9ef SHA-256: 8efd76f962e20d1ad09a191dce2582f69f5ff5c99387d7e50a639806a5c2eccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, disposable hosting sites. The presence of embedded URLs further supports this, likely serving as a lure for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL patterns point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=ghostscript+pdf+printer PDF link annotation
    • https://esvigo.com/upload/files/kogesowenezugaxufusen.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/fitelujozuruvak.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/37926056410.pdfIn PDF document text
    • https://festacontinua.it/public/file/9606314058.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/vudilux.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/64102611863.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613425725fce3---36636708899.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/mowesoxedavepeduvunide.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906191648787991.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/94518161887.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/69549556992.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/42087602042.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/togajiwabatonejo.pdfIn PDF document text
    • http://fivelscope.net/fckimages/1500875536.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/36864920888.pdfIn PDF document text
    • http://ativn.com/upload/file/92211389938.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/63881236749.pdfIn PDF document text
    • https://ptogel2.com/contents/files/bapejugiwekutalevawam.pdfIn PDF document text
    • http://splogservice.ru/content/file/60536894050.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/xugorinegoxif.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/xazetax.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_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 16104 bytes
SHA-256: 133ae473399d3cb31fe46fb52b0eb23d88c8d0dea1e91fb9c4717a6aa5bbbf00
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 10548 bytes
SHA-256: 094b5d9fbfba3662c4f92e9a055f5d7c19915bcca513fa4821879c784e61e9a7
font_02_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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