Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e661abda0237e6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 16:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29dd7a8c592c52771771c0859147b700 SHA-1: 723d523630d98fdd6b3c9890a39c8a1db89a0cae SHA-256: 85e661abda0237e6e1205556d43dab017a7795ffb6a45cc9a3a8257f633ec7fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate malicious intent, including a high-confidence ML classification and ClamAV detection as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://moyamoya.center/images/hand_uploaded/files/lezopedibosoxad.pdf In PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/30153039448.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/57860072726.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/ziwozol.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gozobiserubepisabejajuve.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vawuzagebegiwepowug.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109011306537908.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/walerowu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23459520346.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/97004533101.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911051953.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/ludarodibozokodirumaxokuk.pdfIn PDF document text
    • http://naso10.com/userData/board/file/xexowukiropugonuroza.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/59307302856.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tujetawiw.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/duzojipisirijiw.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f74c5ebf9e562aac0d51c8a747663f3e/zetujagaruba.pdfIn PDF document text
    • http://ave-france.com/pics/files/nexiwitime.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613475f50b502---85407406203.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/19268529593.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wewonowomadodemem.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99684435547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=game+booster+pro+apk+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/28028933997.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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10924 bytes
SHA-256: f276704dec462e4b7481eb96f2d3c18c956387d109b0e52cd5dc0bc4db63bf71
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 19408 bytes
SHA-256: 1341d1ec6af5d459f8e31c69a17cc28e16b6662eab4229cd6cd58d41202e45c5