Malicious PDF — malware analysis report

Static analysis result for SHA-256 6794b3ff5412ec09…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 10:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2e825803996bca12844d4f691d885d01 SHA-1: c68841d2856e25d0995dd85610134c855b94d5c3 SHA-256: 6794b3ff5412ec0969760288d53c58c5dd27a8469b6a26566246ddae16bb9665
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=banking+english+syllabus+pdf PDF link annotation
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/zovijiwulumaf.pdfIn PDF document text
    • http://zalofamanaw.22web.org/45430707925.pdfIn PDF document text
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/6be6b1bc81.pdfIn PDF document text
    • https://xujesosa.weebly.com/uploads/1/3/6/0/136090165/kugotej-jerisa-ximap-mevosupipowuwid.pdfIn PDF document text
    • http://mokajuziwasuto.22web.org/autonomous_annalee_newitz.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/simple_english_wikipedia_word_list.pdfIn PDF document text
    • http://wepixisu.22web.org/48864690662.pdfIn PDF document text
    • http://pukutabutosu.22web.org/64419701581.pdfIn PDF document text
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/5ad07737efbec.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/xasimoxijarugewidude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_263344bb534f49c1ba3e412af016b95a.pdf?index=trueIn PDF document text
    • http://jajabidabewaw.rf.gd/arthrosis_deformans_kniegelenk.pdfIn PDF document text
    • http://dimegebewode.epizy.com/alpro_almond_milk_unsweetened_nutrition_information.pdfIn PDF document text
    • http://wikugojumoxo.epizy.com/lorraine_lea_sheets_thread_count.pdfIn PDF document text
    • http://tivurazug.rf.gd/kesegemanob.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_37fc8362debc42fbb771549a70c3d8d8.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_ae6832a168a74709ac2e61cdec1dbf95.pdf?index=trueIn PDF document text
    • http://ximedamolaxeve.epizy.com/93861719918.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/siemens_burner_management_system.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_e21fc9e2e1f04bc2afbb4471e2cdac92.pdf?index=trueIn PDF document text
    • http://bonoxebagaru.epizy.com/11817919974.pdfIn PDF document text
    • https://129490a0-cfc5-412a-b61f-1b5b786c0a35.filesusr.com/ugd/8d46c2_b2779199173a47e68e5f11bb14a998dd.pdf?index=trueIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/personality_test_melancholy_phlegmatic_sanguine_choleric.pdfIn PDF document text
    • http://jelunegizubu.atwebpages.com/kirchhoff_s_law_questions_and_answers.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_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 5560 bytes
SHA-256: aabb6c18f72962fbe818e24e86090b23cd338d033431cc8b12798b57df6aa70c
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10860 bytes
SHA-256: 4819566d02e14b8a388f818eb2f2db61c9f80e069e5d75a86f3029517bdc7a11