Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8161b78354cf5e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 17:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b103efb272a4b21f68fdaf405499cdd5 SHA-1: 3b948c43b20f1796b8f4dd3010cd4e48e578673c SHA-256: 4e8161b78354cf5eb70bce2bde5503d59fb483256f0c725099f3274504b4ce4f
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 0.9951

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=football+pes+2021+android PDF link annotation
    • http://dtmaso.com/public_html/Imagens/file/59213042780.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/47434580000.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/redelexozifiladeruna.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xoruwasufenozelozarozole.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/87031708432.pdfIn PDF document text
    • https://zagi.hr/files/jepilotutari.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/38771173585.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xafimeze.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gavulex.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jamudikovegivojajawegemi.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/93351056914.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/lararidapofovarezigafez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cba1811f---627064717.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/bobedologevupir.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/36922693647.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/10996348280.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/vijeg.pdfIn PDF document text
    • https://flyags.com/editorResources/file///41848495615.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/45041847602.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8ef50fee---muzokekugusufutesa.pdfIn PDF document text
    • http://surtek.biz/image/files/20150324_023406.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/29650927673.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/dinawuvadupexog.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/58824799095.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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 15460 bytes
SHA-256: bdce2d60cd4246f2da2903633de332f4b3e08154270554fc0a46492c5d5b5745
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10796 bytes
SHA-256: 94a520b41e8221b53bc030b7279cd2294ed8ec6a9fac2be1c53a4158d37e4c4c
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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