Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef887d1a551449e…

MALICIOUS

PDF

85.8 KB Created: 2021-05-09 17:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ece7238be9c7c3e7372795083b46675e SHA-1: fcc0539ecfa9e1bfabec710eb20a4e0087c7c883 SHA-256: 0ef887d1a551449e81852bd72259d90b6fcdcac2c28d38be8228332e7b245cfa
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://botokaw.ru/strik?utm_term=formulas+de+geometria+analitica+en+el+espacio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6020a68f4bb22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fd37919e6adb.pdfIn PDF document text
    • http://titanof-filtr.ru/abcd_2_video_song_bestwapbg5bg.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/soxobewuxufogodesekafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_604ad9b4cba90.pdfIn PDF document text
    • http://www19216801.site/butekozirejafivezam1s7m.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/sitok/what_does_805_mean_in_texting.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/55063027267.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_edf17058b85b450388b893c402ec4cf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/37877230544.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/calendario_2019_con_numero_settimane.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_6d0109e257d746c79af341d19e781b58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/hanged_man_confidant_guide_persona_5.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/redikaruxeketujegavegam.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/bala_bala_song_free_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/80256795997.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/61458310874.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_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 5348 bytes
SHA-256: c00e94a68f254e9f2b1749583ca924b9113ccfd1a23a02379c31221b33feee7f
font_01_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 11600 bytes
SHA-256: e46cc4a2e41925540b623f74d33f32233d235c11a0c428ea3826a43a12f4f7ea

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