Malicious PDF — malware analysis report

Static analysis result for SHA-256 acea19a7a51a1bc2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 17:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ffa573e6df5fcaa35eaececb9c76041 SHA-1: 0751400c28d4e4c35d53888aac140df74532a645 SHA-256: acea19a7a51a1bc280a0f011d5d7f39906aa4c862955e5be4450ed3205866532
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=top+10+most+popular+games+for+android PDF link annotation
    • https://zlataraburmevuckovic.com/files/35523535357.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/riditosadomubazamemeziki.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///nafosivegudisikixule.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/63245419597.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/23455174465.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/81690398452.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/3126482870.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/vakipizijajirokidif.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109150354339811.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/rosezi.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/731755268.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/43787241172.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/26540145674.pdfIn PDF document text
    • https://redac.ch/upload/fekosixibivis.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/63076859110.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/43786276194.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/senagegobexibatul.pdfIn PDF document text
    • http://warehousetraining.ie/images/86381496195.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gejiberofiwix.pdfIn PDF document text
    • http://arucax.am/user_images/file/loraxesunetisusof.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/18039042057.pdfIn PDF document text
    • https://red-adlay.com/upload/files/6448020376.pdfIn PDF document text
    • http://retrofotr.cz/files/file/88579579422.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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 17632 bytes
SHA-256: ac083e58e397083797dfe8954867857a6a838219fbce53a1599da6d572382ffb
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 11080 bytes
SHA-256: 3672b7ee143b29074845551f42419fdb3502ba9c1624db5ccd737abf70536274
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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