Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc046dbd9fd5038…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 03:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4810cf4b6a85b39ade2f3753749f3057 SHA-1: 97b6a0df5f5c8efc9ed6111b84daf87da14fe7d7 SHA-256: ecc046dbd9fd503803b595c16dcb18e2db2b14dd8f1b450e29506e689fa2ff5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of a 'utm_term' parameter in one of the URLs further supports the idea of tracking user interactions with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=magisk+manager+zip PDF link annotation
    • http://nepodoshlo.kz/ckfinder/userfiles/files/90448273626.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/larimokadasaboxuwedisamo.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/xesuropixesovuvuxutoxug.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/39340445416.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142427d106fc---82846157963.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sudabadu.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/59688829873.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93317262553.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sewima.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83929151231.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/fivifafadonidulesa.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/zirojikivufulifazebapare.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/robilulozexi.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/kipetoferibedakodederi.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nafumijovitamomodek.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/18990041591.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zowonapepefodo.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/6140074903.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/47653619452.pdfIn PDF document text
    • http://espicycooking.com/files/file///4938303452.pdfIn PDF document text
    • http://abc-tel.ru/data/File/30352926616.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/788805696.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/regonojubosowazafopoku.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/fuwusalimutogugiv.pdfIn PDF document text
    • http://toroisg.com/public/images/files/febade.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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 10476 bytes
SHA-256: caf3fdfc786eef2b8a16ab2db364e8802a9799b1d5b77ee100f222275a0233f6
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 18900 bytes
SHA-256: 519e23b93fa8bf2fa77bbb69963a9a2dd8dc18435d9b0e389367f22cf3c5f498
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1