Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4dd06dde26c86…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 17:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 75fe57801b06dce1ed27116e0e127c1f SHA-1: 2079ee4c2e63ab484c691b9d99109372ead3cdc3 SHA-256: 64f4dd06dde26c8697ccc91908c871f33a9ca6ca6802b2936c6b7b6e3eb217ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an intent to redirect users to malicious sites, aligning with phishing or malware distribution tactics. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://norservis.info/files/files/tabojumunipose.pdf In PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/67913101782.pdfIn PDF document text
    • http://full814.com/upload/files/dokemojukanizogo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906125813.pdfIn PDF document text
    • http://htcable.cn/d/files/38173701818.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/51240346973.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/kufogesikepiwe.pdfIn PDF document text
    • http://abnicum.ru/files/file/sarekaxipuvutexutisa.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/31942075748.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/86775655886.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/27131572559.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/54890242456.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903021259.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/goxeji.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/27735930507.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/3107311936.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/pasud.pdfIn PDF document text
    • http://voijin.com/userfiles/files/tetug.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/govole.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/7082165099.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/wivifesovolatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+install+cinema+hd+on+amazon+fire+stickPDF link annotation
    • 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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 10972 bytes
SHA-256: ccbcc38b198df7174941a8d2f41a902c29bf464e8786d0294ef86c0d7de8cadf
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 17560 bytes
SHA-256: da98f7e5ab86fe675ccbeada3984142da670a5e8fb8f9d36fe58c8c523b2f798
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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