Malicious PDF — malware analysis report

Static analysis result for SHA-256 1142e27d5b24fb13…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 08:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae254f038f47e331a4a20a873950985a SHA-1: da1761de83dd617d79f3218324319b858da25fc2 SHA-256: 1142e27d5b24fb130601e6f05eadd07fa094e4e96a62767a5c2f0cb4d0a6bd8f
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/123?utm_term=cara+membobol+wifi+zte+f660+dengan+android PDF link annotation
    • http://eslife.pro/shareholder_agreement_template_free_singapore91zor.pdfIn PDF document text
    • http://mebelintera.ru/classic_dungeons_and_dragons_modulesgkcdd.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://tiboxul.iblogger.org/learning_to_see_value_stream_mapping_book.pdfIn PDF document text
    • http://meetraisins.club/what_is_hdmi_pass_through70wsl.pdfIn PDF document text
    • http://good-production18.site/does_tris_die_in_allegiant_movie3wad7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_72252740c41e43c3ba39d3589e786be4.pdf?index=trueIn PDF document text
    • http://posugez.epizy.com/bohemian_rhapsody_guitar_sheet_music.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_a3387181773b49b18c80d3e9e6fd9727.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_7bc4860b6cd8461b90459469b2549a9a.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_a93ece66817e4783bf8645fe5d874061.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4223310dc2194602b7267e140fe608a6.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_5f7d19a2438d4270bcc483b1cc3fdce2.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_f2ebee0d0cfd4c809a85d41c3e0b2886.pdf?index=trueIn PDF document text
    • http://muburenimigalu.epizy.com/asset_accounting_configuration_in_sap_s_4hana.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_71df295fca1d4a67963e61939078182b.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_ff7b3a0c3a6c45eb9c68c27278e3d997.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_f6eb534d3ad748aea411dc8d599f50a8.pdf?index=trueIn PDF document text
    • http://jajoditad.rf.gd/67896247365.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_07af4e16d96b48898434e0fc66cd5c48.pdf?index=trueIn PDF document text
    • http://dokajita.rf.gd/maple_leaf_learning_worksheets.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_a21714c9fd614a90acd4d98f3f86fff0.pdf?index=trueIn 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_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 5532 bytes
SHA-256: 9f060656816208ee4b094e5bfac9043ed9d0058cd5228789202423f7317b2d55
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11216 bytes
SHA-256: 1537a0190a7a1086604cfae1772cb66fdb3884225ba313e021f0c0b848b93527