Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8bc184e71143d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 09:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abc91f71ecda8c7717e6e2576887335e SHA-1: 7b2c0a418d525a39747bba190c134f3c84b95f1a SHA-256: b2a8bc184e71143d1dc35f54d3c45824990c6e8ddda50a312fae6565ba494516
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rpsbchamber.org/editorData/file/mapolavelogetuf.pdf In PDF document text
    • https://zhongzing.com/uploads/files/202109041557234252.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vazobabez.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/wolifawupov.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/76576ce7b6b5ddc06da146b3a7088c40/zuborujinazeda.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/waxaduxateviduzobububizad.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/23126934e30cd7192aaa306003186dc6/develinixowaxuvorofe.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kalifomuriguxizekag.pdfIn PDF document text
    • https://digireg.cn/upload/metawideruferomubado.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/niderogigidoxomabopiro.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/dupuzewir.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/xixakopupowogavajidoj.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/16747647993.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/jezasofiduxesuguzodigisu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/4751695162.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/gonitixonafupetofuden.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/26409728476.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/18641963869.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/22651172824.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/ritirowozapegezoz.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/26137559018.pdfIn PDF document text
    • https://people11people.gr/uploads/File/88896144498.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/tewuxomufitomemolex.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/95275667297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mortal+kombat+x+unlimited+moneyPDF 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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 18420 bytes
SHA-256: 4ab5457e44c532af1efd5b523f4481fbe39d7e3f98d57734d59c1e4188655070
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10784 bytes
SHA-256: 9001a27528d052efb2dce103e8e4151219287eaba2a5b37010a1e0105a033db6