Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d087dcbe8c71e9…

MALICIOUS

PDF

76.7 KB Created: 2021-05-19 01:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 06d94ef9dd2fe23e4f239895c5fccf78 SHA-1: bf7494cb884ca9d06d34105a02e12652665b27ef SHA-256: 76d087dcbe8c71e956b6fef72bcedbb51b02c68b06534af96b03cd83fb5f17b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or distribute further malware. The document's structure and the presence of numerous links suggest an attempt to manipulate search engine results or to redirect users to harmful 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 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://vilenefex.ru/wb?keyword=the%20tale%20of%20peter%20rabbit%20the%20original%20and%20authorized%20edition PDF link annotation
    • https://lefeputabewaro.weebly.com/uploads/1/3/2/6/132695219/5705113.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/6c7ad368647fbf.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/1388c0521c36b.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/kewuxejikiwe/is_all_betty_crocker_frosting_gluten_free.pdfIn PDF document text
    • http://netawakobal.rf.gd/toro_corded_electric_string_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350fa0bc-5271-48bd-9d0d-c560ff8056c5/stihl_ms_250_price_canada.pdfIn PDF document text
    • http://supisozireb.rf.gd/22_clues_level_18.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/26876076999.pdfIn PDF document text
    • http://toloruware.rf.gd/grade_6_math_algebra_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fb7942-b0b2-4c05-8860-9a175855f4b8/how_to_fix_a_kenmore_700_series_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/retrieve_archived_gmail_android.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/peace_logo_wallpaper_hd_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/total_english_placement_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/licence_pro_informatique_alternance_lyon.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/tevegokerevozopekosigeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0810a7c-4235-4dab-9d54-014c9e0ecc0d/rilodawol.pdfIn PDF document text
    • http://kibowetesuve.rf.gd/3ds_max_architecture_tutorials_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61251037-ef9a-4a6f-805d-96b83dfc14ce/how_to_reset_a_funlux_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/94782732542.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_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 5264 bytes
SHA-256: 5c85d44146ecd2c84ab61d05ebd4f45142cb0ee94cf074155c07e8c7ceefbd31
font_01_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10716 bytes
SHA-256: 4c446757f3b8cab239dc6b53ce1482e6f6881461ee735aee43dc101e208dcfff

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