Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb395a995dc9a06e…

MALICIOUS

PDF

67.6 KB Created: 2020-11-26 07:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 893995403023f42a8fc53c2c6e9744ac SHA-1: 929966fd19fbb90eb2365edf711f05e4a8ddb9e0 SHA-256: eb395a995dc9a06edc85744da2cbc1f7d18831a4315b10747b35e6781e2acad4
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 0.9998

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://trafftec.ru/123?utm_term=short+story+map+graphic+organizer+pdf PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/kukagonuwusanukul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5f951b2b75486.pdfIn PDF document text
    • https://vezupololepabuk.weebly.com/uploads/1/3/4/6/134600483/4034555.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/fosirowulofom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_5fb5357214cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f8958d1ef15a.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/bubeto/doral_cigarettes_official_website.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/calistenia_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/22387295059.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/convert_word_doc_to_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/mejalalesipum.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/tugopudumad.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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 5792 bytes
SHA-256: a586c01876a1df39099eac89a56ec41a607362dd6b2bd580c3aeba620b494d16
font_01_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 11044 bytes
SHA-256: 76531102d9ba87677dec2d762a16a39c7b7a54f16172fd55a0fb584c545c6bc2

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