Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3bba91c58705a1…

MALICIOUS

PDF

76.0 KB Created: 2021-04-23 06:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15b0171986ebf138a96841ed7707f699 SHA-1: f39f5af739506d78773661dee5ac8a9d4ae1e39f SHA-256: ba3bba91c58705a13099b9826f66ed7a0d844ed020e72ad6621f57461e23166e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=calculadora+texas+instruments+ti-82+manual PDF link annotation
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/zufawiwadoroxukubi.pdfIn PDF document text
    • http://odemebayisitrafik.com/city_mini_gt_double_stroller_chicco_adapterz12nw.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/jhsZbI9/ranking_top_100_universities_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/hEFLjbW/fatal_fury_special.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/gbijjg0/twitter_download_apple.pdfIn PDF document text
    • http://curvepreloved.com/amoeba_sisters_video_recap_alleles_and_genes_answer_keyigu6b.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/ignou_ma_sociology_syllabus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/g2OTM3S/twist_and_shout_violin_sheet_music.pdfIn PDF document text
    • http://begdas.fun/bisugagikemolifovoghdf9w.pdfIn PDF document text
    • http://prostosite.site/craftsman_109_latheef8m6.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/sagawexojorow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/pdf_file_splitter_free_download.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_cc35681dbb0a483c9c389f64b71ea8ae.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_358e27ec28f24ba997a0d3dc12311eae.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_9c818a6e91054d3996dbea9b043b2bac.pdf?index=trueIn PDF document text
    • http://faleferesevo.onlinewebshop.net/ukulele_chords_easy.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_1dbfad5c5b5a4e29b24a8a5da8b741fe.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_d0a9c8586b3c4f09ba735b12f09c0b9b.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_c1dcc17a22c541d4aefc9fe46fd87d2a.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_9a75a8e385be4d049aca5f26497decc2.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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5416 bytes
SHA-256: fb7b3f04dbc898a10b98a004c62eb59de1fe5b205f9fe99561086cc0900344e8
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 11176 bytes
SHA-256: 64dab666556a09cb22bda38613f4e604a6388fde5c972a85ef7710522b10b53c

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