Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fffb4ec1b8aee7…

MALICIOUS

PDF

89.7 KB Created: 2021-03-28 21:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 47a2bc427acca0dfeb9a3d4c3f7b927a SHA-1: 73aee56700b3972bf29538202cb37e1394e9c94d SHA-256: b9fffb4ec1b8aee7ffe17b49eddf1c2e772d94c21202da08c2e3634dc8c5ce33
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=what+is+the+book+the+strange+case+of+dr+jekyll+and+mr+hyde+about PDF link annotation
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/jaderi_dejabanamo_nazamiragasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_604e89e2b2b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_601632bdc6ec3.pdfIn PDF document text
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/rawepexumibifilem.pdfIn PDF document text
    • https://vosujesu.weebly.com/uploads/1/3/4/6/134646347/5238091.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/jigenusonadisi_dukelobi.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/250d9.pdfIn PDF document text
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/1e9a17f2e45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokamoba/65728313100.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/55328304576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd42a17-a279-48c1-a80a-9ce50de2ed2f/39064641262.pdfIn PDF document text
    • http://ludoxijijux.rf.gd/al_quran_mp3_full_offline_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f27161-90dd-4998-89e2-6fb26abe08d4/the_selection_series_book_3_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/diziziziges.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/32568645137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4edece15-667d-4682-a608-63bee0f0ed44/chaos_in_the_city_of_splendors.pdfIn PDF document text
    • http://lijazujarakowom.epizy.com/aptitude_test_questions_and_answers_for_tcs.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/collapsing_toolbar_with_tabs_android_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276cad81-901f-4e1a-a00c-f66f4be53600/what_does_the_song_bad_blood_mean.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_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 5832 bytes
SHA-256: bb1d3a35b8c3fba0a4f126cc5fb7755934d0817920c79d60c2586021a59a501e
font_01_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 11772 bytes
SHA-256: 5adf222d935ca9ad366e58e7f01a300b7506e40857204caf4c086207986d8b9f

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