Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbb0c5ac9fbcdcb…

MALICIOUS

PDF

66.5 KB Created: 2020-12-15 13:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2bd613351e30b00d864e40210ef4c8a4 SHA-1: 9ea83abcd16e0ae663e1e04317517bea32cfdc34 SHA-256: edbb0c5ac9fbcdcbf947a00cb1dfeeb842a9654786a87bf60b908b08513b36a9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, with a critical heuristic identifying it as a link farm. One of the primary links directs to a known malicious redirector infrastructure. While no scripts were extracted, the structure and numerous external links suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/123?utm_term=christian+historical+fiction In PDF document text
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/b09db.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/nuxebuzebibodade.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/93ba1fcb-afa0-42c5-8a6d-4b6e473b1863/torumisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760c89ce-e618-4a9a-8e6c-c4a7f771b71d/five_characters_in_search_of_an_exit_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0f2ecf-0b27-47dd-961b-4857ccea73d1/auburndale_high_school_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1e655f-7981-4c06-b96c-253cd242fd00/brinkmann_gourmet_charcoal_smoker_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd8b0a0-0cfc-4c7a-8204-fde7dc1366c3/26807286442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5a6847-2530-43d3-9b88-5214b46b738a/lakshmi_ashtothram_in_telugu_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/knights_of_columbus_scholarship_2020_winners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c07d3ff-8639-40bd-ac5c-8b7cef82a9ae/lafilonin.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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 4876 bytes
SHA-256: 4af0c68af95b063eaa935c674c8bf0e4f51672fa20ddf9feeba9eee8dfe19cac
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 10612 bytes
SHA-256: 61306071b96cb2e3dc64573f727c5ffc2d8a75fe1272a4be777126cf5bac644f

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