Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec1e87603758e6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 02:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c20e260a8714e7a5e1ea5f9b0c089202 SHA-1: 71e673afbbb212e4b4881f5f3bf18a6f21a16c12 SHA-256: b6ec1e87603758e6591f2c0a14a03fad979bf4f9560b254a429ca59920fef754
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 external URIs and is flagged as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=papa%27s+to+go+apk PDF link annotation
    • http://ozhelalikram.de/resimler/files/67899072802.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nadupikivajesaxivipuvuz.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/90522274858.pdfIn PDF document text
    • http://beijingteye.com/upload/files/24381539787.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/54829399646.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/timivuv.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/65782021833.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/wonifilelasisusakobubo.pdfIn PDF document text
    • http://petrduchek.com/files/vugugonetijari.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/22567404559.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vamusezedomefikor.pdfIn PDF document text
    • http://zenithmetals.com/files/17620767771.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/leloli.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/gebuvifudibu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a21fe2125---gugajelij.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/pejevefakikuzusetijiwi.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/1499596373.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901181422260608.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/tarumadab.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/vitozazezutam.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b46c7ae72---wutusaniro.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/kodoluvoneraxut.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/1426206887.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/24241089101.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27973203756.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/31223878428.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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 17668 bytes
SHA-256: f1230d1b4d97d0e33adc735e354c7186c11b1f76d162d90fae98f56da29fb8d3
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 10080 bytes
SHA-256: cb171af7bfe330aac936fbea85a874d23fdd92326f616b6e213c7a1f2aba15a5