Malicious PDF — malware analysis report

Static analysis result for SHA-256 4828d8c1d19a15de…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 04:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f020793ded2d8730872afabe73e2c43 SHA-1: 2a39cdf24ea17153e0e93d99d3715107d7b5f92e SHA-256: 4828d8c1d19a15deeded245d3c82320e5a22abb800306a8b562179a84138c680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=how+to+add+ringtones+to+my+phone PDF link annotation
    • http://koreaseowon.com/ckupload/files/20915263492.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65609542063.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/17292768730.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/58372696048.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/24081891717.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gularabodumev.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913161705.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/supasofavowakorume.pdfIn PDF document text
    • http://skupka54.ru/upload/m/63022562607.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/lokuvatepopu.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vetawere.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109101705466535.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/runukosozatifuw.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/38366047365.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902225120.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/boxudabus.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/61382285092.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/veziviwebimilum.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/33015016245.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/5932009099.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/sexepovobukiziwu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/76655325448.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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 16684 bytes
SHA-256: acbe105e48f2d7648eb307e87f59484aef234b04f5ba6c266e9d4e3e4ca7d760
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10984 bytes
SHA-256: ee6d64937e3d277c868778ca41c10598e7b466df92bc293feff27ce1553cc163

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