Malicious PDF — malware analysis report

Static analysis result for SHA-256 353fb35d50fb4a15…

MALICIOUS

PDF

75.3 KB Created: 2021-02-22 13:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f81bc6e3982661e5a0a8277337e77a28 SHA-1: 3b59c5c5e1180f1f68e95e55d507b90f7670aa2e SHA-256: 353fb35d50fb4a15b6507d34bdca2ef81efee34aad4c0b51b8d7ea756e84ef6c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing lure. The primary external URI, 'https://jottigo.ru/strik?utm_term=pizzeria+deville+promo+code', indicates a deceptive offer to drive traffic to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://jottigo.ru/strik?utm_term=pizzeria+deville+promo+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459054/normal_5fc6b6191576e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_600403639cb8f.pdfIn PDF document text
    • https://cdn.sqhk.co/jutirupot/bPFFjic/chess_rush_meta_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5fd828b9a38ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_600744918407d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5fe1290f4a889.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/cibYdjQ/ice_cream_summer_frozen_foods_cartoon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fd082902f191.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/7d8901b9bf6b16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16f7903b14.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/ayghb9p/fuwolupetizakije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420250/normal_5fcda922b7a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_6018545adfd5b.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/bewibiwat/bafuzigopewafowen.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/time_connectives_worksheets_for_grade_2.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5152 bytes
SHA-256: 4e0626d6c6707632477693f716e6e7aae34d817e5dff21dc5645c89c3cf593bc
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 11532 bytes
SHA-256: eb23a6e72127ca07210b2870858e8e902147bf68263a2a1fe5e53767154256a5

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