Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf023c16de3b6be7…

MALICIOUS

PDF

73.8 KB Created: 2021-03-29 00:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d87e977558c6102dfe21528dcbca0792 SHA-1: 8cf672cfb2027076181914bedd680217211ffbef SHA-256: bf023c16de3b6be70c17a78ce75de58bde6798e4e6fd2dff8d6e131d173ad1ee
156 Risk Score

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://botokaw.ru/award?keyword=mathematics+formulas+pdf+download PDF link annotation
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/luzasu_bodulutasu_kuxez_nobulawokati.pdfIn PDF document text
    • http://cleanup-sale.site/607440536638s5rn.pdfIn PDF document text
    • http://mihetos.xyz/74683614456jfode.pdfIn PDF document text
    • https://gikemozepuv.weebly.com/uploads/1/3/0/7/130740444/7615269.pdfIn PDF document text
    • https://vebexedupatad.weebly.com/uploads/1/3/2/7/132740253/e8e7e57.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/didipitiradur.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/petikamov/80187120604.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_36911f54ead146aeb47a99a2352cdb7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/rewesenupi.pdfIn PDF document text
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_ed12c587c7ed4aa3abea921097977f87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/how_to_use_presto_pressure_canner_without_gauge.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/simplifying_and_multiplying_radicals_worksheet_answers.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_123c8ff7bfbe4e67af806f14976bef0e.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_0b64319c1c1b4354abb2a4e00b026cff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/33366049702.pdfIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_07715ce3e9e045989dbbd00978d65324.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/sipumop.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/fallout_4_ps4_building_controls.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_3b650efaafe442499e6074969a99624c.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_54a9f53847e340919fd6f39b1235ba30.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_2ba4c9aa90e44dea867b61931623dafc.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5492 bytes
SHA-256: 81984add5d3a3cc5d46882fb90b9b2a5012e952e97cbba269173b1cda08927b5
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 10276 bytes
SHA-256: 4a2c96136b53faf6630708c8d420de085a601a6454ab6de23d3a4a0c07af5624

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