Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ef115e2b75649…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 13:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fb013cd2663de012b0435cd333f677b6 SHA-1: 205930788a63f52ddda55ea70c9d869761b01466 SHA-256: a25ef115e2b75649ec2ff24c97c33632c4172f8688b9c5d6d8f6ef19731fc36d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it's likely a trojan designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=queen+loft+bed+plans+pdf PDF link annotation
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/bowezelorotono-vijakux.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/rotowetuponez.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/X6Lgdgg/sneakerser_paint_pen.pdfIn PDF document text
    • http://sazaxizixukuju.iblogger.org/pozojozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_601c6b79369b6.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/j7gg7YG/madness_combat_scene_creator_12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_601e20dff0ab0.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/wifagumapugona_sumoragabuk.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_600d55297a76c.pdfIn PDF document text
    • http://papotupeti.iblogger.org/75948911728.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/0Eb4RuS/west_game_cheats_ipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galexuduxegi.epizy.com/unit_conversions_worksheet_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/able2extract_professional_v5._0_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0d5cc9-0f67-4b70-96fb-1efabdbe2e3d/what_are_the_rounds_in_cognizant_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f35e96-f5d3-4ead-a7bc-c68692ac9b91/jivubadower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9014fa9-5b35-41e3-9bab-0c6b59b00b48/sanawezukebibebupusegu.pdfIn PDF document text
    • http://vegonuwulaki.epizy.com/biblia_version_latinoamericana.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/59400214395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb22a5f-7994-4490-8b57-d2a76d271bf6/michael_vey_book_3_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd5ecdd-6a28-4f4c-ac22-63edffe6a1d6/2608764014.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5140 bytes
SHA-256: d30adfdf4409db355bc16120a4a4f2cc274f05b0bef38933e26062f3d4f79560
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 11444 bytes
SHA-256: 68a92d4bcbc5262df5f546903b3e73f4d0ff1750485713c62361390d4c313b41