Malicious PDF — malware analysis report

Static analysis result for SHA-256 39095d91877a2c67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eadfca812ea387b4c7c5c122039db08f SHA-1: 3a2d2f94e340b63f85d85d32f838cd4ed087266d SHA-256: 39095d91877a2c677c2e48085eb028434cd999b92e76318925867cf90df73e6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=codes+for+airport+tycoon PDF link annotation
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevudexokapisuler.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/89287016825.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/85576499753.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/9121646880.pdfIn PDF document text
    • https://dintek.eu/uploads/file/52607727984.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/51804893795.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vegirufizedunu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rerapiloxenaxu.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/72809607209.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/8419897433.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/60694900958.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da78b9d6bf---74969583556.pdfIn PDF document text
    • http://byecook.com/ckupload/files/potepuxoxunorekesuzejowen.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/50709488119.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/96718185571.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/jenabuforen.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zegovukajizavezut.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/36896803165.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/58534424740.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161309549a65b5---gujovavadawakuvefi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nogebazifolemikoruzutijin.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/39234138630.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/21293256335.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 17668 bytes
SHA-256: 2b41b53a7773693d4c5ea35ea8b066b96aeb92954f6b1855e10553c828ee4f42
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 10712 bytes
SHA-256: 735a105539c2bbb6a0b8ff946049c99a7e076aa1199f8e01aab2df6231a131d2
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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