Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4ce8167bfd67da…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 00:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0fc6efb11c06c108ee4f6b89049eb40f SHA-1: 6b52c4299a1da5c6053852afde4565e4ba908185 SHA-256: 3c4ce8167bfd67daf5f0fa2cb9a0d76f37ad5c7b3241fd790e5c602da5084aac
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 0.9947

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://synerhu.ru/uplcv?utm_term=avengers+infinity+war+full+movie+download+123mkv PDF link annotation
    • http://choragwica.pl/userfiles/file/8503985524.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35395853610.pdfIn PDF document text
    • http://sdds.be/userfiles/file/33578278727.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/19994131123.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56547943772.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/funurawebeki.pdfIn PDF document text
    • http://electric-kernbichler.at/zodadetil.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/silominejupenid.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/sarugaxo.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/54065475106.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/divarukujir.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/28727392729.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/40711903378.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zujeromoka.pdfIn PDF document text
    • https://bem-sa.com/img/file/niwozaretapazovut.pdfIn PDF document text
    • http://secretinvitation.net/images/files/28837734749.pdfIn PDF document text
    • http://favourtec.com/attachment/file/bunerutusoxepeloduboloki.pdfIn PDF document text
    • http://robbes.nl/media/files/zusoguvikiwusug.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/sipax.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/52877218990.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h1drgcgipfirkh5hu200q5fcqv/mowusevelikunig.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/viwedisipasarigadepu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eab1945ad---jusurotagibanuxagiwin.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fivitiv.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kidobilus.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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 18620 bytes
SHA-256: 97c101342db8cb14b59a2fd9742935db43a866eada23b3ff0015e96d80c76dd3
font_01_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11480 bytes
SHA-256: 80a813b69ec5e7c9e21bb46201a84c86cd8301c9a2d48bfe03dd14de792b25a0

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