Malicious PDF — malware analysis report

Static analysis result for SHA-256 104d875e1691facb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adcc400493e8d5adff0aae9625c83a0f SHA-1: f8117dc1c1458c55c620e8d5a6f99ea1941326ee SHA-256: 104d875e1691facb3f6c5a256e7d78d6621cb325808cd6d6ac6d054e5de6a6f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a probable phishing or malware distribution attempt. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites.

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://crewmak.ru/uplcv?utm_term=samsung+galaxy+young+rom PDF link annotation
    • http://maksimetall.ru/files/64870657932.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/41476407084.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/78230429666.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/81501056594.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/30716102744.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513c982674---zavonusexujo.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/5308735532.pdfIn PDF document text
    • https://sainaudit.mn/File/39042362481.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/61663292914.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/katozug.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/98063890282.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/25052154565.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/busafunixiboveres.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/63143764600.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/58358981932.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/suxufad.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109250945538542.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/54228501886.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43915604932.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/85092238979.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/91696100965.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/3629594408.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/tokotilanavukozojufosuwok.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/17360268759.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/nipuboka.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_off0000b0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 10520 bytes
SHA-256: 06f40ee629d2539c1fb0d2269c313eb0b1041083d7eb25c8a47153dc0098982b
font_01_sfnt_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 15772 bytes
SHA-256: cd36b97b09d81e3c8e27ba848e0482a9ba63bb01e1007df4a9e21380e626d6ea

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