Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4b2ac62a89529d…

MALICIOUS

PDF

111.6 KB Created: 2021-09-08 20:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: f1e22a55df6dc72e550a7a5d63185c44 SHA-1: 02915a964bd1d6bade2f041badf63514c771a578 SHA-256: df4b2ac62a89529d117f624a17a832dbed4f3e4d25cc74ebbdf362d18fdc0845
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 0.9970

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://philabc.ru/uplcv?utm_term=climatemaster+tranquility+22+manual PDF link annotation
    • http://www.iece.in/userfiles/file/54100106982.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/kogusunexezegozokebif.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/16973522310.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/satugubuvugoberuzo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/6143954684.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/butidufegafuv.pdfIn PDF document text
    • https://latework.cz/soubory/5578594838.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xumobovafonojimavegitedex.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bupixax.pdfIn PDF document text
    • https://cian.hr/userfiles/file/gobabimalitekevolixajas.pdfIn PDF document text
    • https://parc-hotel.info/file/wunifivaxenilezedizali.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d86b4548---19655517799.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/rapuwiwelifalazesi.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/kikazisurobizopubuxuvoj.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109032211502744.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/zepupala.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/bdd46b973f636b020bb9bf69bcc832c7/18829654210.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/66095177912.pdfIn PDF document text
    • http://strandedtattoo.net/file/4907563278.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/taxetojabasa.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/25351670600.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zinunubiburerovafukuseg.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tizekezakezofirolalibibo.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_off00014884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14884 10660 bytes
SHA-256: ca2c857ce3f53a64c3e8601f507a0b855dded7f81cb63258d9de3a810258d30b
font_01_sfnt_off000160fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FB 20508 bytes
SHA-256: 24f5ac6e71aef60e55fb33d9a5f29615619a5bb226eb3077e69bcfe5e8dfda8e
font_02_sfnt_off000196f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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