Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d5dad3e69a68dd…

MALICIOUS

PDF

82.4 KB Created: 2021-03-10 05:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30d37944a7d1ab626588a1896e736beb SHA-1: 93d4391564bdd1d8008502d22c2f4ff4b3c50f9d SHA-256: 25d5dad3e69a68dd6a3ccf6935c9c07fe7ef545aed169de9f4f00d535e406cd4
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 hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=medullary+thyroid+carcinoma+ata+guidelines+2015
    • http://nuxokavarop.22web.org/52840424992.pdf
    • http://naguvogegexaze.22web.org/how_much_does_it_cost_to_send_package_internationally.pdf
    • https://cdn.sqhk.co/pinofizulag/hjA0Igg/dragon_s_lair_mini_arcade_game.pdf
    • https://cdn-cms.f-static.net/uploads/4386848/normal_604679e4a11aa.pdf
    • https://cdn.sqhk.co/tifesijoja/b9OvigW/90295880904.pdf
    • https://cdn.sqhk.co/ferorigife/Wxhj0r8/gestational_diabetes-_endocrinology_guidelines.pdf
    • http://gesabagipo.22web.org/metric_unit_conversion_word_problems_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4420432/normal_6044d0088857f.pdf
    • http://jesofazom.iblogger.org/averiguar_si_un_imei_esta_reportado.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60465e86c3ea5.pdf
    • https://cdn.sqhk.co/molodomo/Siihhjj/ball_freshtech_orange_marmalade.pdf
    • https://cdn-cms.f-static.net/uploads/4379841/normal_601609953bce4.pdf
    • https://cdn-cms.f-static.net/uploads/4493602/normal_602f895d04177.pdf
    • https://cdn.sqhk.co/kagitenoru/djcjfLa/lomajuligutodemipuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovilowab/empathy_map_template_doc.pdf
    • http://sidimusi.rf.gd/monster_vape_labs_liquid.pdf
    • https://s3.amazonaws.com/gimufesajo/92081977263.pdf
    • http://gagimuludodu.epizy.com/juxiziwatikaso.pdf
    • http://gawadatij.rf.gd/65049199864.pdf
    • http://texatopewewew.epizy.com/leprechaun_3_imdb_parents_guide.pdf
    • http://medozazi.epizy.com/habanera_from_carmen_violin_sheet_music.pdf
    • http://tilanetojik.rf.gd/rslogix_5000_training.pdf
    • https://s3.amazonaws.com/resisuna/kabawiwiwixifuf.pdf
    • https://s3.amazonaws.com/ruzaganog/free_bobolebobo_song.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101fa.bin
ab97e72d228a41c5fe9b73b112a0f8dc04365a6b40afd5318cb27af5ee54f024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 5912 bytes
font_01_sfnt_off0001160c.bin
190dafe1172009bd687e78e7fa05a703d370355a54542f14eae1e65141782f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 12036 bytes

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