Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f79d24c021deb9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 16:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7969803f09a7147e57deba46e72d687 SHA-1: 502329dbbac6c8b5efd87f2d16a8857cea88f015 SHA-256: 19f79d24c021deb98099a6c42c7149005be4b9c86e67b7856229f8c14219ecb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the nature of the PDF heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

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=cannot+turn+on+bluetooth+android PDF link annotation
    • https://soudureornementalelauziere.com/upload/editor/file/71136351767.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/natukasilufukikisevu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138956581811---nepedibutito.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/34785521048.pdfIn PDF document text
    • http://houselandia.ru/files/81645345859.pdfIn PDF document text
    • http://apismorava.eu/docs/15815405890.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/tewixigobujejexujan.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/89843227798.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/73182951607.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cc04ca94---69037202722.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/lutidepe.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/30769096985.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/kilidabefaba.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/44229498168.pdfIn PDF document text
    • https://turbooto.vn/upload/files/nubusukenofenekixu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/37040972273.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/1569717999.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/fokewadekapowita.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/matomob.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/wekamabadabar.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/22248362108.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/96512994531.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/lonovumapafoseg.pdfIn PDF document text
    • http://parilka.by/var/upload/file/lagewuz.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 18072 bytes
SHA-256: 50780d81959b2da08e1aa28a9ac00fdd287253a89b380129024299d5d201df8b
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 10448 bytes
SHA-256: 1653ce17ec1056383fbdf4ab565111832898f300d5763b3619aaeefb79374e48