Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71b79dff71d7cce…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 09:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53ddcfac5a0665c41797743286b274d9 SHA-1: 7189458ec274ec424a8609a5070e7e0d058a51fc SHA-256: b71b79dff71d7cce7e4a2913e1720e2d24df53e88276af853ac92f34bf8f2162
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 0.9997

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://baarspo.ru/wix?keyword=bianchi+sport+sx+bottom+bracket PDF link annotation
    • https://cdn.sqhk.co/wexifidobafo/jjPxN2G/latest_werewolf_movies_2017.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/kixojadedizebunubad.pdfIn PDF document text
    • https://davijune.weebly.com/uploads/1/3/5/3/135315517/41ccb1b301cc8b.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/vczohiK/cash_app_money_generator_no_survey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_60414bc5a1a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/ihyhjvg/bawomurisubolevob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_6034ef3a499d3.pdfIn PDF document text
    • https://xetiwomojebiwif.weebly.com/uploads/1/3/4/7/134714835/4284f3f.pdfIn PDF document text
    • https://zowadite.weebly.com/uploads/1/3/1/3/131380399/fekazujisarunedizot.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/lakadutof/biblia_de_jerusalen_con_indice.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/26896397836.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/serif_affinity_photo_android.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_c7ed767090e143bf9610c64453dc2dc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/pabuwixazederinotuxane.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/which_is_the_cheapest_arduino_board.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/basic_home_accounts_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/smartsheet_dashboard_charts.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_025c477201ff4bb09614f907a8d6f5c1.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_c06a39554978462a9eb4d79c3657ee99.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_bb95b3d46a704b9b82ea757775589bcf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/33938755111.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_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 5464 bytes
SHA-256: fab24efb7d36372ea4e1d72edda11d1afd66ea252ce57c3372c092852fb8bcd2
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 11180 bytes
SHA-256: 98a407fd24d093ca1aa3e4fdde5368f3ce501e147ec9433b2c49593f11c663ba

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