Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b6864310860b9f…

MALICIOUS

PDF

68.0 KB Created: 2020-11-11 11:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 289b16b8d7d81b7699ed47ab8dd13ff6 SHA-1: dcf513aab93d49b66c2a167fb148a9e01dac02db SHA-256: 04b6864310860b9f0fd7bddee475b774e59368ff428f5bc4ccdfa4ea368bc4e4
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-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.
  • 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://traffking.ru/strik?keyword=6th+grade+math+worksheets+rational+numbers PDF link annotation
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/lutake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8f233d348b1.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/purawuma/sinugukuparufafetoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/guitar_hero_3_for_pc_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/nadazaburusurotapuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/ceresit_cn_69.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/questes_analise_combinatoria.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/34501060587.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/38061246540.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/waguva.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/fifivezazilomudiwotifozis.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/58190717013.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/94991156172.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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 5592 bytes
SHA-256: 9cf55f6beb4fd965239f9c48e033148e719dab60760f7e4cdf5380e146298a28
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 11600 bytes
SHA-256: c51db6158cfeb09f8801658bae8368f9460c33de17977fca8c46e3e81131e767

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