Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb21df0bb3ed9000…

MALICIOUS

PDF

78.8 KB Created: 2021-06-07 20:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1d263f584ea3876d66245b44ea4569bc SHA-1: ed9608add716283a636277e41cc3b1063c9d1056 SHA-256: eb21df0bb3ed9000c5cf9c7d8de3730b57b1df088fe862f2bbaca0a942145223
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'smidgel.ru' which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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 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://smidgel.ru/pbw?utm_term=baby+girl+growth+chart+percentile+calculator+uk PDF link annotation
    • https://tifefosejamixin.weebly.com/uploads/1/3/4/3/134370351/sugepajewim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_60514fffd3b67.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/libolupox-josolivex-vuloz-fapuz.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/8a9843c4c5e.pdfIn PDF document text
    • https://tanibegaw.weebly.com/uploads/1/3/4/6/134600132/4627770547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_6053dd80640d5.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/2bb0e223-136c-4b0b-8668-448faa5c2de0/95122767238.pdfIn PDF document text
    • http://papedisuk.pbworks.com/w/file/fetch/144798189/troubleshooting_microsoft_wireless_keyboard_2000.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/24798730925.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/mission_mangal_movie_download_filmyhit.pdfIn PDF document text
    • http://bekojifutok.pbworks.com/f/selesaf.pdfIn PDF document text
    • http://lovizabodi.pbworks.com/w/file/fetch/144741432/sedivosevexosemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a31be73-8ba6-4b99-bf0e-36df077c57ce/necchi_sewing_machine_522_manual.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/balam_pichkari_mp3_download.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144652140/11495755899.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/prentice_hall_mathematics_geometry_book_answers.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/corporate_approval_matrix_example.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/f/ccna_2_chapter_3_exam_answers_v6.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 6476 bytes
SHA-256: 6b33ff188d28154d6dbdbf812d80b7b44c2f9bc5adfe8bd5e5c9793c1c79fec7
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 5464 bytes
SHA-256: 1b08a1c4efed46aa14cf252b12a67fcceab9dbc5540a93e8680891cb3b9a74e2
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 11028 bytes
SHA-256: 5bdfed95372239877b891bbfd479d76a24941d7aa017042e37dda1eea8996cdc

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