Malicious PDF — malware analysis report

Static analysis result for SHA-256 4358d2e5aff11683…

MALICIOUS

PDF

82.1 KB Created: 2021-02-05 14:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bdc033ae39700bae6e5e423d744a8c47 SHA-1: 93df9230787b2ac1ea164140b4d2e733dcc3b87a SHA-256: 4358d2e5aff116831223564034a19839e2b4b80bbab474043932cbd92882e8e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://jacksth.ru/123?utm_term=juegos+grupales+virtuales'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=juegos+grupales+virtuales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fc7ab5d569b0.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/8597883.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/jmiiKKR/best_free_camera_app_android_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/ciejbgg/game_recorder_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hjxhgij/chennai_super_kings_team_2020_owner.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/lelogefa_gonusimerasane_zinopukobakezuv_rurozema.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/9922804.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/xamumafol-zeliv-ketuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_60069ced26fba.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/h0M8idU/8908521517.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/mjg2hxw/among_us_play_online_unblocked_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_601500dc9cbca.pdfIn PDF document text
    • http://curvepreloved.com/8th_grade_reading_comprehension_test_with_answersz7xvd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/38535340232.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/kusezuresafadiduze.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/kimasemigefapevufimuxega.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/kuccps_2018_admission_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/54563359013.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 5036 bytes
SHA-256: b6f4cb8b045ac6ae5ff9ebdfaf799b0e80bf109765098dd2d1f00ddd75bbbffb
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 2232 bytes
SHA-256: e4fc62ad40493524cdb7d92c5a7c723e7c025f30b24943118572ba12618df054
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 11884 bytes
SHA-256: 6f98ab522723ec15585e74fefabc49c9f4ef70b1f1dd7e4b89fb860bb781b860

Open this report in the interactive analyzer, or submit your own file for analysis.