Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8fe2f6bfa6694a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 18:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37419e6123f1319bdae4cc45a3d41ce3 SHA-1: 3e3c9a3bab35f0268eae1cb4ade8428a8db53916 SHA-256: 7a8fe2f6bfa6694a7f8bec628ebd677466992233ec4b27e4290b56878fa54c69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations or engage in link farming. While no scripts were extracted, the presence of many external URIs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fukaofoods.tw/uploads/files/202109011516416003.pdf In PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nopugoseturuxaka.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tujabowazeji.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161429cab132a9---92542340097.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/28175478045.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/64849916524.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/91234327003.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/09111bf771e15afb3aefc481ad311d01/95549552222.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/wosomexorewipepixalorin.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/renuxidixere.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/66499420515.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/66389109152.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19112792193.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/bexidolujirinalexezilefa.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/14511633504.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/wowomijolo.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/7800765466.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/20535657148.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/94727526652.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/4202212309.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/dufonilotud.pdfIn PDF document text
    • http://888chji.com/userfiles/files/8833056826.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/jilepetuxuvosowusowalud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=just+sing+app+androidPDF 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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10480 bytes
SHA-256: a383417a310a5f2d4c7fb01fcfc82a8479a9eb2fd481107c12e4bffd0fab352f
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 17624 bytes
SHA-256: fccd74bc989b827325c08601257b68688af08a55541cbb27151d045c2d3449f7