Malicious PDF — malware analysis report

Static analysis result for SHA-256 c654611d11b6de7b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 20:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a44ed590dac73773d97a3621bca02aae SHA-1: cebe7cb8220d121f4f4945c1fd5a8137d0255e4f SHA-256: c654611d11b6de7b4a23814c20d354afc9fab0f17ac0ecaa277fd0511f11fcbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=fortnite+android+epic+games+download PDF link annotation
    • https://isleo.com/i_photos/file/19713460487.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/83307916116.pdfIn PDF document text
    • https://csn-alliance.com/data/files/muduvapil.pdfIn PDF document text
    • http://www.centralperdana.com/file/lijilapilewowavataxur.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/36750531446.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/megelirumujew.pdfIn PDF document text
    • https://clickbox.ro/images/file/koposawomozurob.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/96646577244.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zodufeme.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fekumur.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210919_2AFCD81C3FE6048F.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/laxujupewukami.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/14748867318.pdfIn PDF document text
    • https://loyd.rs/images/file/77591016951.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/82502559597.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/jedakonixakobigovokazo.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/jabikarugu.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/27525042836.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/tasetowuzapababugoxipa.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/73500509680.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe91497a---vejukavubakanozefo.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/xijuxinekoxujivusowepewod.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2273fbecca372c32ed1872e034f73068/21408066233.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lepekuwime.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6136a907d797b.pdfIn PDF document text
    • http://infracsap.hu/files/file/67730272064.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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 18096 bytes
SHA-256: c02923a8acb5df63f40dd4a72e7fb61ffd39c00da8f750b2e1df060aec089c12
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 10920 bytes
SHA-256: 6231216cf3eca80ee69b80136d892606aa040faf32ad54c9cbacacfb33bf2b28