Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafc14191aa4f92a…

MALICIOUS

PDF

97.5 KB Created: 2021-09-11 22:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97cd868f828484d916d17166ccf5f682 SHA-1: b9deca86f68ad52585e3c2379cc26a88ea9baf46 SHA-256: dafc14191aa4f92a5fa9dc549a4994946518369b4e51f73bea695c29b95977de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host many links on disposable domains, often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=android+app+development+using+java PDF link annotation
    • http://littlepearlspublishing.in/data/eimages/file/61451582003.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kawagusuxijitubalibatag.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/67302491741.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/61301118192.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/pozaveketuwolepe.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/54630187461.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903185531.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/61272702611.pdfIn PDF document text
    • http://davcpundri.com/css/file/38072739867.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/giwaji.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/42367151946.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/naguxaxugawow.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/28552801528.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/xowomopodidajagenejovizal.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/31644802543.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bojugojafabi.pdfIn PDF document text
    • https://langumeistras.lt/i/File/21621139409.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/fuwabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f43d284b2---69360916215.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_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 18756 bytes
SHA-256: f64309a934af1c699fe3e5a76d4eafb4fdb44a07867506405bda3cc45b84e146
font_02_sfnt_off00015f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F06 11012 bytes
SHA-256: 08f4dbbd44cb0b65089ecc5dc4039869d8cc610261d208a94b63620e0df3812a

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