Malicious PDF — malware analysis report

Static analysis result for SHA-256 48894d988ae1d0b9…

MALICIOUS

PDF

71.9 KB Created: 2020-12-15 13:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cd39397e1184575b6fad01505debb702 SHA-1: b6a63681889aba9b2b55ea9b2620f6d82fab084f SHA-256: 48894d988ae1d0b9ac6ed7a98bec758d5ca55217e70dc1a5c0ca13aa1fc730d8
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://trafffi.ru/123?utm_term=beth+israel+cemetery+new+york PDF link annotation
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/1735986.pdfIn PDF document text
    • https://nenizuve.weebly.com/uploads/1/3/4/6/134615173/7521940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38acfdef-205c-41a8-932a-2f34882efa0a/57372925232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2115b25d-ceb5-48d3-92fe-460cf5f680f2/died_in_house_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976b08ee-bd7c-4e2e-b8ec-bdfd8a836f21/38736070964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c301fbf-7d16-449d-8217-194420f25350/55230446662.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/balanitis_candidiasica_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7068a53a-e273-4662-aa9c-76a24cc24de5/ratomovovavatenubixaduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0174360e-674d-4888-9e3f-440a20339018/long_term_effects_of_acute_carbon_monoxide_poisoning.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd161247f0db06af82d5fd/1606227474634/1498267639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20536afd-ac82-42a2-a448-bbcea989d2c7/69528298018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfec0c8-8e8f-4442-960e-bd14bc226423/19405858460.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf615afa04221c7118018e/1606377820060/types_of_soil_conditioners.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 5348 bytes
SHA-256: 087089115c96eb18f3baaa78749230137d41716bd926b92346baf96a8463a6b7
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 11200 bytes
SHA-256: a735ff164ab33bf2e21d3aa61b7062a6e703b707a99a0d8337a5f865c5e3d53f
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 6084 bytes
SHA-256: 0bbd385887db5074fbd87256d70f98a882c9353f1362fd6c1377f0ce146e0394

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