Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d621edfa2043a2…

MALICIOUS

PDF

91.9 KB Created: 2021-03-08 16:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16ad15a5f0a89d49263becd499e5eb7a SHA-1: 9a8a03a4a7b14c4b5c25adcd47413900f9fe62bc SHA-256: 36d621edfa2043a2840df29a2b8575e4765a524152ecebc26feb3fe7c65c45f4
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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=graphic+designer+curriculum+vitae+format+pdf PDF link annotation
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/dapixesedaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/guTjcjg/health_wellness_health_news.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/mebalugavik.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/jeduleju-natexipaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vimavifuse/jehjUhj/sound_blaster_z_equalizer_settings_pubg.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/9040562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6021034c86994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5fffb6238f98f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc7405802e99.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/jimirivej_luxogi_junojaz_fogolegi.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/2PgcEN2/dujabukidokefa.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/hjhihts/wuluxugulelodigewikekegas.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/wujapu/employee_performance_evaluation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/nuwaneregoxemuzonasebejij.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/43731898207.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/mezupovodedufomobedum.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_cb59340405ba43e884d1f327f87cac23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/duzozadoze.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_5f5730eccb524cf5ae259c9bc2b5af46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/chrome_remote_desktop_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/auto_transformer_starter_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/62042651139.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_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 5660 bytes
SHA-256: b7d1b6143b701b3e3d95cfca9355f53da93bc885668c2e9ece4df8eed27f73fb
font_01_sfnt_off00013e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 10428 bytes
SHA-256: 174ced92695a6999fc8a4717b33db1aba6c786ddf40c5b22c259eb580abc18dc

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