Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0660c71899db3c…

MALICIOUS

PDF

68.5 KB Created: 2021-06-07 13:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5f77fd7cd677f0810cdc4d6cf5dad83b SHA-1: d6cf1e0d5ce7946bd9e8ea760845e03dbe425b67 SHA-256: bf0660c71899db3caa16f6c25c42ea6cebbcadf6f56bc3b75b5ef3a87276061a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with one notable example being 'https://wastran.ru/pbw?utm_term=tally+chart+worksheet+tes'. The presence of many external links on disposable hosting suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/pbw?utm_term=tally+chart+worksheet+tes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381101/normal_60013a8d54294.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/zenuvetosokopedevim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6020d3f11eadc.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/8007929.pdfIn PDF document text
    • https://kekofujazedelep.weebly.com/uploads/1/3/4/8/134879672/marekuj.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/bixisep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446017/normal_5ff4bde234b2f.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/7393738.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/1efb2750-4ff9-4db4-ad7e-035351399bbf/45822087286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724d3d2a-6b8d-4ddd-ad7f-042c1fe86683/subtraction_with_regrouping_worksheets_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c741631-95a6-45bc-ae2b-3a1f6f8df827/tp_link_tl_sg1005d_v8_0_switch_-_5_port_instructions.pdfIn PDF document text
    • http://sejawes.pbworks.com/w/file/fetch/144715779/bill_wilson_emotional_sobriety_the_next_frontier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f9f353-eb80-493e-ac0a-12c50c5af4c6/speaking_phrases_for_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0e08dd-f38d-4f7d-b06a-be18948f2c22/agatha_christie_best_books_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6a4d59-ee14-48cd-bc8b-3c7b6e7240d2/3700067694.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144539379/how_to_potty_train_your_child_in_3_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bfd210-961c-4c34-9431-049d3738e4e4/will_ps5_have_exclusive_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27d4037-ccaf-4bf5-9a34-ad0939225a6a/libit.pdfIn PDF document text
    • http://fomebin.pbworks.com/f/nds_emulator_download_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c225be64-d795-4ed5-a10e-ad510708a0e3/do_we_need_home_inspection_for_new_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5051e2-c258-4cb4-9f89-c9ac7998bd40/current_issues_and_enduring_questions_10th_edition.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/etapas_del_desarrollo_psicosexual_de_sigmund_freud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4686c6a6-7e01-4fda-9d33-38af8638e316/xojirugorisizile.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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 5092 bytes
SHA-256: b75031be59dc399d4b4fcc9e3f9cd762c90069ffd91974810105022fafd16177
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 9740 bytes
SHA-256: 4cf6e7d1e3b80d3c5cc01eda990cb1da6e8b5a601875b2c0dd70b3af0120a7e7