Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d6c6790e30f3e7…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 15:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f21eb955e726676680d2426572d0b39c SHA-1: 70bdf6f42949a892bb97a5e65c91a4c5d6113bbc SHA-256: b2d6c6790e30f3e7697d6e1b9d7f89d008f91dfd84c80fe8f4c8a3a56963df56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or SEO spamming technique to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=hey+monster+apk+download+for+pc PDF link annotation
    • http://wuvigirigu.22web.org/high_school_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxugaveg/iczSghi/lego_batman_dc_super_heroes.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/gugoniza.pdfIn PDF document text
    • http://kumorepo.22web.org/kakavigevebemadapusamuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Cchduid/vegax.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/wimanudixan.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/rupatojuko/kopasitiperoko.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/company_profile_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/75035936466.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/bimudurikorevusos.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/bc_residential_tenancy_act_inspection_report.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/boney_m_songs_free_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/interval_notation_worksheet_for_students.pdfIn PDF document text
    • http://wedizakur.epizy.com/pozeku.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/19408876929.pdfIn PDF document text
    • http://zexozanut.rf.gd/ceo_up_roll.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/38834676706.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/alexandra_palace_school_sixth_form.pdfIn PDF document text
    • http://tidomag.epizy.com/kimupudakamaxojobexi.pdfIn PDF document text
    • http://suwulinivez.rf.gd/55589510763.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 5520 bytes
SHA-256: 7af6573ea909befcf95e2a048cb885ad00742a05cff996882c77ddec4fbeaa87
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10128 bytes
SHA-256: 41609bfb95fadf05056aaac48042cd703861c0ec39c594ae68087b5686f31405

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