Malicious PDF — malware analysis report

Static analysis result for SHA-256 e087ed6c6ecbd0bf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 04:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da89dd572be2b824703f094a815907a2 SHA-1: 93a4972b04ed0d5ae9f951727d1722a84fb99bfa SHA-256: e087ed6c6ecbd0bf36b1cbec557d7a2006497f5c193e4c43b23ab9867b5eb7c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which are structured to appear as file downloads, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=android+hide+work+profile+apps PDF link annotation
    • http://emirates-offshore.com/uploads/image/file/72063239369.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/furoxuwug.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/fajukikejegulokono.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/gowifeb.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff901d516e---37290718108.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210911030159.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/36035072124.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/44870876830.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/76794934582.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/tinolij.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/digup.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/zazov.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/36996237367.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/63502371896.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/purivizosakagatexiv.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fulosodulubaropinipaw.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/39600284235.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/laguzenurad.pdfIn PDF document text
    • http://markone-tools.com/upload/files/56523870422.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161359e1bdb229---68034590041.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/timopavifineranidimegop.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dupexapiwizizezi.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/sakuses.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/wetukalomuloruluwiba.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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10656 bytes
SHA-256: 6dbd646ffc1cebb44ab1cc62ae732e0c412ba7781c715334b7bd2cb39b0e34f4
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 17180 bytes
SHA-256: ff39d6f776a7e23860beea0bf571c88cb3aeb5fdd744d117378c93ebe42fd516

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