Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e76a00a29788f8…

MALICIOUS

PDF

68.0 KB Created: 2021-09-13 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42930ef58a55f20fb5c5efdf34c14c89 SHA-1: 9f1c7f1d7e751d5472a96ff280ed78c4e2ade4fd SHA-256: 89e76a00a29788f8272c1a31343ceead5a79adceae66b0abfef24e2524fdc4b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=opeyemi+akintunde+books+pdf+free+download PDF link annotation
    • http://highgaincomposites.com/img/file/20219419521.pdfIn PDF document text
    • https://lecachet.fr/docs/files/wumifuxolusuxuxubuve.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/ziguzanetixewaf.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c825ad673---93707011965.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911222859.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nexikadu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pomobosirojaparup.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/vizakelilimaderuwinin.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/sitizofalivizoweloparozu.pdfIn PDF document text
    • http://axwelindia.com/uploads/voboxutarinopalimufuxi.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/9111061831.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/49160566901.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/kidagi.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/85773380405.pdfIn PDF document text
    • http://sjhtractor.com/d/files/75103479298.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wuponurobezimoxif.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/muxivus.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a1fa444dea24d46dcce59c1db66234d1/tolixosinedevawa.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_off0000a989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA989 15260 bytes
SHA-256: fe7dd2f5a695791225a19a9effc020da484ec4260626a5f484afece7ba652066
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 11216 bytes
SHA-256: 5bac345eaa4b7124a351ea721998445f61962bac431d4770244754724be731fd

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