Malicious PDF — malware analysis report

Static analysis result for SHA-256 727d354e9215be4d…

MALICIOUS

PDF

72.2 KB Created: 2020-12-18 00:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2d25091879b21017b1af7d8cdde5a19a SHA-1: bad0fee2e248db9a73ea28362da5791a42c0a371 SHA-256: 727d354e9215be4dd4516c9224a403f7a69795ebb92ce36e4cf066aa0514a4d1
214 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, which is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. One of the embedded URLs, 'https://gettraff.ru/123?utm_term=list+of+naturally+gluten+free+snacks', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?utm_term=list+of+naturally+gluten+free+snacks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f97690475a57.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/7137418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5f99cb849c02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8f6949e9ef0.pdfIn PDF document text
    • https://lelewubinuzuton.weebly.com/uploads/1/3/4/7/134771703/ab82049a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fa2a331c56b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fb81bc450624.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/jukoxisojow/65174388464.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/pikuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33b8b3dfdd95b60e431f6/t/5fc789607995075abde78c63/1606912352811/17988670831.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/9097361864.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/eliminar_cuenta_de_facebook_android.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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 5156 bytes
SHA-256: f8ca1589fcdd81a374c0783d0396e89c4e4329558988a43039a60b48bd29dc15
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 11104 bytes
SHA-256: 5bc1f2620e074d8f35f9df4621c8ed4f983254758f2477484f3445a66be0701e

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