Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aa123f36f32f56…

MALICIOUS

PDF

76.0 KB Created: 2021-01-14 07:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f7058d5016649916dae4b2a901eb47e8 SHA-1: 6ceaf16adf74ff88fd3d5837eeeb37a773d3187e SHA-256: 17aa123f36f32f56742fe85cbe0a3784db5531d4f2dda0d2bcf353b350cc89b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafftec.ru/aws?utm_term=treatment+of+isolated+systolic+hypertension+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5fc539ec2cfdb.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/XtPVEqr/puppet_master_in_real_life.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/jediju.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/D77Zbjc/40917781541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5fbab51f9a151.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/fingerless_mountain_bike_gloves_review.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/latokedibuvab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5ff7c95f1ec46.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/jhC0KxO/f1_tv_ratings.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/egggdMS/rematejogubafaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fb3fdc760dba.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/wobuzisibal/texas_comptroller_sales_tax_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/free_blender_full_crack.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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 5444 bytes
SHA-256: 02620b328dae52a28ab044d3da3420d4755474d824f75c26d34fcaa4618714a4
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 11388 bytes
SHA-256: e6189ccf50f197784a135bbdf5692737f4064208b3157f0d6a8b1886a2884a82

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