Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea888ece12b94ec…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 05:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48608c3e27d1bfa5e74101e3808926dc SHA-1: e153f62c3028c02694eb951f26e18b73d465d07a SHA-256: 1ea888ece12b94ec660241fc94e1bb22b9e0fc1099e8f548ad252eb8669f80ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://soeurs-scjboran.fr/soeurs/upload/files/10386735736.pdf In PDF document text
    • https://shiokuda2.com/contents/files/lamureda.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/15594091805.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kusexadiwaf.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/nexujusirurufixorejinepiw.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/81642486602.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/kurikaka.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/48226192877.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/57389777848.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nudebowuletukizubevo.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/59255508312.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/76711803396.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/kudifivuto.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/8865827227.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/66077443010.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedobabuvubatobapijamerex.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/94900910400.pdfIn PDF document text
    • http://findacommodity.com/upload/file/53382688727.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nazunajaxewut.pdfIn PDF document text
    • https://value.ae/userfiles/file/19154500833.pdfIn PDF document text
    • http://rubensova16.cz/files/file/66880520412.pdfIn PDF document text
    • http://orenprom.com/img/account/file/90571236600.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68235738794.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17330643252.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/32914542651.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/19356587520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=data+link+layer+in+computer+networksPDF 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16448 bytes
SHA-256: 53c139335e075fc18f50f2b8cc64f6ca734988bd93cb6834366a8e75887eb8c4
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10928 bytes
SHA-256: 84c754d9cf3e341d9a703289be02b9923408777c660bde3669e7357294c68e3f