Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2b6db456e462b4…

MALICIOUS

PDF

88.9 KB Created: 2021-04-06 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1fac3a2efd8da95c18cb4c33d22c5f5 SHA-1: b888d9acf7377454881cc2252e1a7ebf80fa00ae SHA-256: 8c2b6db456e462b4e52590947b8d0f79e08f1c1cedeb17e1e8c17c6d14b224dd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9992

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/award?keyword=sheriff+seismic+exploration+pdf PDF link annotation
    • https://cdn.sqhk.co/sugefixa/Lidifqc/50970154030.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/free_warhammer_rules_8th_edition.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/dijubopusuwumabulugonax.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/hfVjjgj/37551225989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_600fc4ce338f7.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/biology_notes_for_class_11_chapter_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcd51d68c16d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_6003b7364aa5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_604bbd9527c73.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/ojgcKFE/super_crafting_and_building_2020_apk.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/37553319696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_1478e5db59fc4df2984876829315ee8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/dirty_would_you_rather_questions_ask_guy.pdfIn PDF document text
    • http://vameberimonon.onlinewebshop.net/sri_rudram_tamil_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/authors_purpose_definition_antonym.pdfIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_4a0b8c7cf75c41f69ac838356b535d53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/amazon_adventure_telugu_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/netemaxunitaxopag.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/43246374997.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_c3b039dd0b13497aad15399a1c07eea2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogonof/palayathu_amman_movie_songs_in_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/66144526739.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 5352 bytes
SHA-256: 19625bab06bea6f2c5aae69f63f23f5150568a9da93478d282c78521deee8d12
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 11588 bytes
SHA-256: 43275a16dffbc4cbe1b29f1ecb5b52b44319be2746d3684f6699db9f0f598e83
font_02_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off000145f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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