Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b39246e6bc7db7c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae943986c2efd70be8f0f118dd5587f5 SHA-1: 68c57af8e99f034e4b3cf4a4bc037e4155b338d2 SHA-256: 3b39246e6bc7db7ca01865b5e02e98dca9d3144fa8c2a20913cc190ff3b59b1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, despite being obfuscated, align with known techniques for delivering malicious payloads or redirecting users to harmful sites.

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 http://www.39koratmachinery.com/file_upload/files/27844289483.pdf In PDF document text
    • https://producedepot.us/userfiles/files/21271124188.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/29eu04i2u54t7ij6i7drp4sebd/motirotaduj.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/75027062516.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/kibubudaxupagapixepujelod.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/xasimaxurofawizojivize.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/37718427083.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamatisejigiviz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/52271039408.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/26994660926.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/35864855311.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/85748298029.pdfIn PDF document text
    • http://cutskytools.com/d/files/ramuvakupe.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/27768788462.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/binumewonidas.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/fexajobivefokupuzobaseset.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbf446734---85178689596.pdfIn PDF document text
    • https://betsin.org/userfiles/files/saxubo.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/rafebutejapibovode.pdfIn PDF document text
    • https://faceless.me/userfiles/files/fasofifavina.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/dipujozivegovoditivux.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/towalafuzudujozuzo.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kafinobefafalosapurotit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=setting+notifikasi+chromePDF 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 18132 bytes
SHA-256: fda278a650419e265507cfc139d9c63335efcc1c2e39846bb16a4d9f947c734a
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10904 bytes
SHA-256: 6bd813147dedc032aa408a14fa0c9a7605a9c5585ff1ddc660e9f15c91b84efd
font_02_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1