Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce649fba5012ab…

MALICIOUS

PDF

76.0 KB Created: 2021-05-27 23:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e28d04bb08bfd2e0ca94c2d53cf5327a SHA-1: 66f484379174e1e24b98e1011d5455323abfadd9 SHA-256: 50ce649fba5012ab922b99a584cfb629d2fa302e37b75c426fd104f17849b6ff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=binomische+formeln+anwendung PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410722/normal_6013396953ed8.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/f1bd2c422aefde0.pdfIn PDF document text
    • https://dedarapovoxorag.weebly.com/uploads/1/3/4/7/134748910/914808.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/tewuvurelale.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/4553222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_6046cea5e8388.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/zunaxosatix.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/7609473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38041b83-3bdd-4a29-9bd5-297b282b0136/the_four_spiritual_laws_of_prosperity_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89109d6b-11b9-4e62-969a-41e53f05cd0e/lamborghini_gallardo_price_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7470b7-3461-49bb-8cbd-ba5db6549a05/will_there_be_another_season_the_crown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89881e17-0d5c-4565-80c5-ae961baa8812/77036749299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64de813f-fdb3-4b78-8cb0-6965f8f6cbba/icom_756_pro_iii_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7de0ff-da62-467e-ad92-4e6b9fcf6315/what_did_the_first_internal_combustion_engine_run_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64873e31-2cdf-45b6-a8e4-2d373457665b/fewodenosisekona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03a376f-7fb1-4f6b-9cf2-7489216952c7/what_is_the_best_wireless_keyboard_for_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6ad719-f9fc-42dc-8433-fda26cd23d62/best_amp_for_mtx_terminator_subs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef64e85-204d-48c3-be23-eeedb01f6414/how_to_program_liftmaster_remote_to_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f5d9f3-58b7-4edb-a708-8288c9f56b8c/32372144732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c94f23-7a48-4cd8-9889-62c6130562c2/mary_poppins_cast_new_and_old.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5576 bytes
SHA-256: 7a1aab4170b7f3371e567875b9429661a58b6709c29c8291ffeabd1731faab99
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 12008 bytes
SHA-256: 13606e42ae68d469b331e6b85d785e7e842dfa1093cbd31a524a35f2f9871ec6