Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80553839d7355a0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 03:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e62237d6d5e8b659aa8d8c505fc13871 SHA-1: a75ef72b71e6218dd88c28cbb65e24d9ddb0e6ff SHA-256: f80553839d7355a0d0febf8ece0806f8afb9ccc61c9d222929f4335f2590d31b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vejwun.cz/images/vepefezirilalukemejif.pdf In PDF document text
    • http://arcos-eff.it/userfiles/files/zepaverupago.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/64937730309.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/92534708183.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c68ca32b---21797811356.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/66393625602.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/64312256276.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/larubegolejalemuna.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rekemugajeronerod.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/xuseguwezezimuwe.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/mojovinugemuvarebibopafi.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/pavirinuvanuwurezebowiba.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/46200757167.pdfIn PDF document text
    • http://gdgom.com/upload/file/210907150359342841no5dy3cs0n6k.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911221521.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/68288722549.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/pubolepuxugijasuwefeda.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/41808271066.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/wobowumebaviseli.pdfIn PDF document text
    • http://chemicalengineers.ie/images/96494683096.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nomadurojulipozijasox.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/zeselabedet.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/44164238232.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/bodubuzawivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=contacts+in+androidPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 18184 bytes
SHA-256: bdd5ce1b296d921c256c084d03762c842521d675b8169eede53ad2b59d12ea75
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 10216 bytes
SHA-256: 4bcecb5804d2ae1bcc50a1d9074b38d789c135e82ff4dbba1d29ed9416499c68
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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