Malicious PDF — malware analysis report

Static analysis result for SHA-256 4650d627f7d96fed…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 11:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b6486c71348a4c769e05f2fc9230d68e SHA-1: be0af92e35bc17f2b5feaddab27003cfe5494387 SHA-256: 4650d627f7d96fed8a5faae2479f436b2404054692aa51931d1f1e7345a1d6b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a high number of external URIs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://okzawidow.pl/img/upload/files/57893920369.pdf In PDF document text
    • http://chikatere.com/Upload/files/totujiluf.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/91192337831.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/gewaka.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/35944846749.pdfIn PDF document text
    • http://linker-apps.com/files/damezuxikobilaxule.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/48246095096.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kobenijirukuze.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/12620579659.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fejumatenafeneguvin.pdfIn PDF document text
    • http://tayles.com/uploaded/dijezinakafuvegebapevof.pdfIn PDF document text
    • https://novsport.com/content/File/ditidavixej.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pedunusotez.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/rodizojopivesidoxonu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/13844589174.pdfIn PDF document text
    • https://efnnma.org/files/file/56585998943.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/45270017494.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/jofozubirovafaxo.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/89039554229.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/57656152018.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zimurokukewarukoradoso.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tulupinafeposipade.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/xopuzapa.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/57238010525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+access+a+private+igPDF 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_off0000b4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 14860 bytes
SHA-256: 34be5799279be315d27cea84be8f547800141beec59a66d01ab5ad9a7dcd8e7a
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10540 bytes
SHA-256: d9f2988563a3f69e52ff876741f4fd7f26fe85193fad0b3e1cb9cf67ae28057b

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