Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d89b0829327af9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 14:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 620afa577a1132aaa9e709072dc708b9 SHA-1: a898e5c489b4d8f16a4d3869e1b9182bccb2ff31 SHA-256: 44d89b0829327af948b6cc5b6050a6c104e1b9a21efae5cb1dfae45c288de2b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://massageindex.nl/images/uploads/69497202568.pdf In PDF document text
    • http://canshu.dlzj.net/upload/files/20210910230439310765.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/59066327190.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/97664541805.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/tapanopezajewiduw.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5af5a0434bf7314d14ce5573577ff440/diwuxipakiromalore.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/80536195336.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/40588838669.pdfIn PDF document text
    • http://wenxuezj.com/images/File/44857964899.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140424db2859---20665198245.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/71638657322.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/43848828372.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/49633692139.pdfIn PDF document text
    • http://pasaru.com/upload/files/62385943606.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/23243993935.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/fekeritisutanegatudizik.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73438047578.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/pabozodir.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/regogevuvidade.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zatesogadixobo.pdfIn PDF document text
    • https://anaksemut.com/contents/files/wafawujuru.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/72161549608.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/latij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=locked+out+of+my+android+phone+how+to+resetPDF 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://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_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 11188 bytes
SHA-256: ea3fa2669bb2e91cdcf8d3a83d8765516cd975c19dfcd7a48a412ccdc487b594
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 17620 bytes
SHA-256: 1ecf503a406a07490b39997c2cb399a6e90fc8240dd5b2e170791242bb7bfd4e

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