Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d7bd46dcef60a…

MALICIOUS

PDF

67.6 KB Created: 2021-10-03 03:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3f2d7e8ca3ae195d2de508cfd002159 SHA-1: 97757d25a50e95c44f9768cbf110bd49040592c8 SHA-256: a54d7bd46dcef60a2fbf4806bf64bdfa6ba096615a12c500afda5be33482e41a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://verynailscm.com/user_img/file/zowuj.pdf In PDF document text
    • https://doctmcooper.com/userfiles/files/numexutulakuxevipon.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202110030507135459.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/kizimela.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nusewixizexigab.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/72371203030.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/22372873921.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/temexu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/81259616036.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/94222484480.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/44008591939.pdfIn PDF document text
    • https://eclearusa.com/images/file/22504402656.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/512d82a72eef17671c9db1e7f727b262/wesileva.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/29835324807.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/juwedeteresefizofamube.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kodokazinegegesira.pdfIn PDF document text
    • http://e-sportis.com/images/upload/57118504634.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/67554905058.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/dotafufisetikasoxer.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/5806129560.pdfIn PDF document text
    • http://terminsk.by/pics/files/tozavuzidazivirasuganuna.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/24518088340.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/80966963080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=south+african+golf+proPDF 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_off0000ac1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1D 14740 bytes
SHA-256: da140542b638d14f1b73ad2e2121cf02152f6d9ab30e00f441e559c208d4ecb3
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 10636 bytes
SHA-256: cbef1fb3bf6643b0f189624b3354d9bbc31085d1c59b5c6eb78d98f674b6b481

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