Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae799fbddf3e45…

MALICIOUS

PDF

86.5 KB Created: 2021-01-24 00:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 76050904fc1cad43a0de82d90640051e SHA-1: 317d31be6b4203ceb31e3d936877c5d8435371c7 SHA-256: 87ae799fbddf3e45bbb745dc3fad620d5d12c23cfc8a6368999b8c6d13465d51
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/wb?keyword=euro%20train%20simulator%20download PDF link annotation
    • https://site-1174796.mozfiles.com/files/1174796/ghost__io_game_unblocked.pdfIn PDF document text
    • http://xojitufos.66ghz.com/79768069662.pdfIn PDF document text
    • https://site-1177773.mozfiles.com/files/1177773/update_event_fullcalendar_v5.pdfIn PDF document text
    • https://site-1177029.mozfiles.com/files/1177029/download_tiny_heroes_magic_clash.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/fast_furious_tokyo_drift_cars_pictures.pdfIn PDF document text
    • http://lizixute.iblogger.org/10528458628.pdfIn PDF document text
    • https://site-1176116.mozfiles.com/files/1176116/quotes_supporting_school_uniforms.pdfIn PDF document text
    • http://zebolalifitu.22web.org/bihar_police_constable_bharti_2019_application_form.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/fajuvedokara.pdfIn PDF document text
    • https://site-1176460.mozfiles.com/files/1176460/sajumorumenifataroruzijem.pdfIn PDF document text
    • https://site-1226218.mozfiles.com/files/1226218/sausage_flip_best_games.pdfIn PDF document text
    • https://site-1258340.mozfiles.com/files/1258340/dewatikeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/tratamiento_para_meningitis_bacteriana.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/wodepaka.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/fojabefasimugom.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/vedapomikizijodalojovu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 2900 bytes
SHA-256: a4b7c54839293824b13a482706f27d6fe64d34d2fe404ea26f2138a893610c3c
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 4784 bytes
SHA-256: 33eb4422165fdb41e385fc8970339a34e1a4becc3e3fe76214a8cb8ca2dc9eea
font_02_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10940 bytes
SHA-256: 3b3d75d72123176707e0cbbccef244d8533a9324b2cc06714a452ba37f9ef155
font_03_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16068 bytes
SHA-256: f9bcc7848fa1dd2c29eaa5f628cab9cfef40a5ca191136fcbecaef6133835651
font_04_sfnt_off00013dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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