Malicious PDF — malware analysis report

Static analysis result for SHA-256 776023902680317b…

MALICIOUS

PDF

61.3 KB Created: 2020-11-30 20:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 67c67987324eec32a3bc3c4ff162e817 SHA-1: da9df55929255dab07a89765408ca9c96e8d7f08 SHA-256: 776023902680317b72263b261e192c80ae3829bb2a840c3f72205f0ccc23d094
222 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, routes users through malicious redirector infrastructure 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=similar+triangles+worksheet+grade+10+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fabdd641b028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f961bb20cbec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_5fb7658be4993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_5faa4f02bda64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_5fbf4ae8d6120.pdfIn PDF document text
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/0af54fb2f61c4.pdfIn PDF document text
    • https://ralawuxageg.weebly.com/uploads/1/3/4/3/134319431/620d68c.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/fosalizuzu/ideology_and_dynamics_of_politics_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beecd25-12e7-46b5-bed1-b653a0f127b8/20869225547.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/soundarya_lahari_meaning_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/formal_apology_letter_to_the_principal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4086fe-0e09-4208-987f-b9a099ee619f/gentlemen_of_the_row_v1._9._2.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/prospective_client_email_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0d477a-2a62-4e41-be7e-b65270f947ae/antropologia_del_cuerpo_le_breton_pd.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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 5908 bytes
SHA-256: 765a42a3d3a1f8b64c6c8d1d1b1ab939a2ac27033a04fcc2a2b0843fe264237b
font_01_sfnt_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 9832 bytes
SHA-256: 7d4de2209b539d268a5ad938b1ef5ca505df552736877d01b5a37379b8786724

Open this report in the interactive analyzer, or submit your own file for analysis.