Malicious PDF — malware analysis report

Static analysis result for SHA-256 512025a802893043…

MALICIOUS

PDF

80.6 KB Created: 2021-10-13 17:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10f1645156fa5d6e22c3e9ebae3ba877 SHA-1: 5dd481aaff089fe568b65439de09d2f1b3a4fe10 SHA-256: 512025a8028930431218660e6ec9e8c780615bc06cb999adb85af0e624a1a7f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external URLs. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics. The presence of multiple embedded links and the 'link farm' heuristic strongly suggest an intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fruitvita.com/files/files/gesepedelo.pdf In PDF document text
    • http://ccsl.asia/files/xeremodobape.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/nezup.pdfIn PDF document text
    • http://kustari.net/userfiles/file/76256512684.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3383aa0d5efcb833dce067bc42ef4569/jomekonevuvawuwa.pdfIn PDF document text
    • http://tuyendung.btccorp.vn/uploads/files/89491985523.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/87522530717.pdfIn PDF document text
    • https://videoeffect.ir/data/file/6682959429.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/98293666782.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/4783291305.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/nivadogobisozujo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/rufezozetijepaweduxeze.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210914190553818.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/talibobemujut.pdfIn PDF document text
    • http://rem-proekt.com/f/file/31163433441.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/kesilukivusemazakaki.pdfIn PDF document text
    • http://unityproductions.com/upload/files/73163116530.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/94930029393.pdfIn PDF document text
    • https://mahae.hu/files/files/6149846783.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/xuripisovebitarudur.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/92430539993.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kezexovaribotinunekurabut.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wewimago.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=idle+ants+hackPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a13db639562a92188c88f7b8b4365b9/42220913870.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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 18672 bytes
SHA-256: 79134f2aa4ed2cd9b57eb5e83e8d92c54fb7d0c174a3a8e9c5f28473ab0212da
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 10196 bytes
SHA-256: ff98a63636e7a84c7c24349b5da9a00c6617b8e423279e5c6471231b9c1ee920
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1