Malicious PDF — malware analysis report

Static analysis result for SHA-256 623c698e042bc231…

MALICIOUS

PDF

96.0 KB Created: 2021-09-16 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86c6c1cb2df01b190e4934b7f5b04195 SHA-1: 53205f2985d3e38b8f47e58ca9583495de8b25d0 SHA-256: 623c698e042bc23146f38f606274f44fefb442ce80bd76702119ed2831e45d9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'instagram followers mod apk' lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=instagram+followers+mod+apk PDF link annotation
    • http://beta-rc.com/upload/files/zivejokaxalum.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/lurupivenivajuvanug.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/takiwogedetusafiwa.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/92116102420.pdfIn PDF document text
    • http://falconltd.pl/cache/file/xizuzufoguwavizefapaziwu.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/96303673647.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/bizufavolunufixawusom.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/54947362499.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/62521347666.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/tufimaziluku.pdfIn PDF document text
    • http://caramelitos.sk/files/7372119398.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0403286293.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/vasejivimetoxumurisadu.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/65571747081.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/46358369928.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/95354894645.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909015220.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/rixudoxajogibuw.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/ziwixanomakorurerop.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd088f661---56097499873.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/7460644643.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/97936434902.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gofubuvisa.pdfIn PDF document text
    • http://e-menu.hu/editor_up/3746370875.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/gonatigapukizarajif.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_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 18416 bytes
SHA-256: f8b9d321c206cddb78e8d1e0f3a4f75d76c439101319e22b739d937e29f3a6d6
font_01_sfnt_off00014139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 10880 bytes
SHA-256: bd98abb3595bcb1eb2766638ce6a4e5b18659e28e198be3d41cf28cb302e59cd