Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce653096d79c5572…

MALICIOUS

PDF

77.3 KB Created: 2021-04-08 02:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 779cc3f9af3976947c6e7c0cd07b1b7e SHA-1: 7207eab1f9d7bfc36147cffb5859336521a08aa4 SHA-256: ce653096d79c5572ed97b616bf10e1c0093aa17b0cc85d196b293a2681a89347
164 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. It uses an invoice-themed lure. 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 6

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kuzutuzo.ru/wix?keyword=hybrid+car+manual+gear PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367294/normal_60075315b0c1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_600469b8aa663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fc94560e1f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd34657a8cdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5ffbb3325980c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6052fcd066583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6044ca3b3971d.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/tokafanawa/zunivexujebabo.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/53128561016.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_83b2818b39a8465b894888fd1c4944fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea94552d-a61c-4ed4-9d73-21e49fc76f89/26097591822.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/what_is_a_psychiatric_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcd7f3a-997b-4f25-9809-0f2f0bfbad05/75406929481.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/53820873608.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_ebbc06797c584d07bb065a19bfe19fd2.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_e2835e2fccba4222bf98fbbb2b1bff8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa218d4-95fd-43da-82bc-0e1a757c1696/befonutix.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/82398346372.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_ae55d9848fac41cfb56c5fb4ff29f1e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a10482d-aa1c-44f0-9f42-e17e6b60c366/quality_management_definition_in_pharmacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655fe78f-66ea-4b48-a50e-93104b1fc1f7/conalep_alimentos_y_bebidas_materias.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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5284 bytes
SHA-256: 2365f616cbc01cfadf8ea596b664bc7d3ccee9b620696b3b71f88f9b4eeed481
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10516 bytes
SHA-256: 55fa7451532b9931bb40271a822ba5608d20c08a22f62f39456ecdd76932bb05

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