Malicious PDF — malware analysis report

Static analysis result for SHA-256 328e4deb16b83702…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 20:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e08866188ba2481ce60372406bf4b03 SHA-1: 1fd918319f77e20a7d08a62a732d11e950e1005f SHA-256: 328e4deb16b83702214614c5cc8198341bf81a8c8a4c2bcd4b0f16900decf4b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to a URL containing 'remote control apk' suggests a social engineering lure to trick users into downloading malware. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

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://smidgel.ru/uplcv?utm_term=gx+remote+control+apk PDF link annotation
    • http://kes.org/upload/editor/files/kogefadamatesolozup.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/4918687005.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07a28227d---97114445003.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210909045135.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevuvenafedunivefifa.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/mevelatatadanisi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/nafuxu.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/59144702121.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613323917c304---97784017059.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/17847698325.pdfIn PDF document text
    • http://air-con.ru/upload/files/tabadamozex.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/lojafalazugaju.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/purapodoliniladaxuraxik.pdfIn PDF document text
    • http://moretonassets.net/userfiles/37009525816.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/vuranejisefaxudowisolidot.pdfIn PDF document text
    • http://getdol.com/page_data/file/muwesejijev.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/68666371924.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/wabunap.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/toliramojetu.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/xikowop.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/989883247.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/97083187362.pdfIn PDF document text
    • https://atiksigorta.com/files/fodotepivuwogetuwa.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 19140 bytes
SHA-256: fa0a6e2aa786b8c32b2e81fc3dbf59f77fd7e15482f51bd2b9d939dcffd1fe98
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 10508 bytes
SHA-256: df3662dcb5fd8f0112e07f8af2dcb3ad9838bcf318a3a79df228421de9a86aaa

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