Malicious PDF — malware analysis report

Static analysis result for SHA-256 894aa9f588cc1cf0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-27 00:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe10bd9bcb0b66c05693579ef4dd5f09 SHA-1: 7411334492a86d07b8fce40b9d6f2ab051f75c93 SHA-256: 894aa9f588cc1cf07aa29982d889c178a6d947b16fd9b4ccc941fbdc6a93ee84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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://pistant.ru/uplcv?utm_term=the+boss+daughter+2015 PDF link annotation
    • https://specialgarden.ro/userfiles/file/75637185774.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/kutev.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/43075593367.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/73166882782.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/63026749435.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/39195750521.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/watipefiwubo.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/91688422836.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/zemosogoboz.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bolesemidor.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/25610654069.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/1084978949.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h7302t9kv3tkh11h4k7paoa7ir/falanugevixukunugep.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210905040554.pdfIn PDF document text
    • http://kdekdyjak.cz/data/36434518439.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/26836059465.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/17942707449.pdfIn PDF document text
    • http://snft.ro/media/file/48309915580.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/34979020058.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/3926133118.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/ratupovarulorofu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ac475648---retikoviga.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/65236889257.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vewovavadowumoledevazu.pdfIn PDF document text
    • http://abworder.com/uploads/files/30634108421.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.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_off0000ba91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 10916 bytes
SHA-256: 963d0795e829971631408d45443199b70139b9cd653a261e3d71ad7d20acc7a9
font_02_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 19044 bytes
SHA-256: f5f63aea9a16432e8770f6484a62b3782a16a1bfca4ecc703b38c863c3196af6