Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4fac09fae9d94d…

MALICIOUS

PDF

59.9 KB Created: 2020-12-21 03:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5e3e48781ae038bde52a94362ef86cd1 SHA-1: 9b3b6b4e7b3d828fbae87bd0877c715a2a101f7d SHA-256: cd4fac09fae9d94da026c0e28200fea9dd5b40d4859f460e3a5754c1e81d72fb
186 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. 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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/strik?utm_term=hotels+with+water+parks+in+sandusky+ohio PDF link annotation
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/dikejiwur.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/porazorex.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/zarivugapeja.pdfIn PDF document text
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/916b76b52b12236.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/2206647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12921b6b-ecbd-49d5-bf60-b9d0b360578f/telefono_de_despegar.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/62475735242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62c03b4-c420-42cb-b7b0-1afe24e99e38/kobodulodupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68c59d2-502b-44d8-8253-b78fd6a5dda6/baby_shark_notes_for_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d850ac6-129f-404f-ba54-9b214781d6e9/30289439018.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/50682853255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be8b37c-5e86-41f5-bf3a-44067c8f164c/clasificacion_de_las_cirugias.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9ff03a83d042422c3343/t/5fdd198e7013094f4c5f5dc7/1608325519055/19372947827.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_off0000adf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF2 5268 bytes
SHA-256: f06f9e87939282f6e954e99e70f5821e342583b283cc6af5a5a1161fddd1af5d
font_01_sfnt_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 10252 bytes
SHA-256: 8bb81b93c6881fa300c4e208608cbbcc1ed74768303997b8910a1cc8400b5f54

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