Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f4c737f129c99…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 07:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be11540899352e24246d552aee2f8122 SHA-1: b1d749f5319dbd50f62dd3fdc44a2bc3baa6d391 SHA-256: 628f4c737f129c99f395d6e08d38c751819a87ddd0284350f87b7d16b4b57453
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=los+doce+pasos+pdf PDF link annotation
    • https://medarbindia.org/ckfinder/userfiles/files/42011226382.pdfIn PDF document text
    • http://kccmaul.com/files/files/80008365479.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jaritirolajutunepodazumu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/koneberuretibozigila.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/tudak.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/5490047818.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/43240256741.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210905161457.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210917181717279.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/83896ecde6821cad7d675c15ddf966df/fowavunevopolijogogawena.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210917233014.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428710879a---lewufalozajak.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/05/33463146533.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630838870.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/28282503758.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/33164686879.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/xavoto.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/72490138251.pdfIn PDF document text
    • http://hkacca.com/userfiles/goxevipilukeboxusuw.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/54976151504.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jerugasuxozazos.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jepanazapabixala.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/sepelinurozijotufa.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109132348525094.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_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 10128 bytes
SHA-256: f1c063180ffdea26333c075c19cc8d0de3832a060f8a312b123ac167be1c5eca
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 18056 bytes
SHA-256: 4f0ae85721a62acf01541326f45d1ea283385679e2bcca9b6fe47bdee51a489d
font_02_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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