Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb87249a3d19fe0e…

MALICIOUS

PDF

71.9 KB Created: 2020-12-27 15:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c4f5c219cfeeabfb986c403d08290d0c SHA-1: 283750b69617bb39a8c4e9633955177a2aa6e927 SHA-256: cb87249a3d19fe0e0a8be9ade1add0b438e69b17e606330ac44a5241162b7480
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to lure users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this document, likely used as a phishing or malware distribution vector.

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/aws?utm_term=evangelios+apocrifos+de+juan+pdf In PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/xejivomezopadobejori.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/e0665348-6535-43f2-ae48-68c9e1fedfa8/feloniwipilekowipakedoga.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/puritanism_in_scarlet_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0425d2-85cf-41ef-9fcd-e8de5f8d2a5e/epson_wf_2860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e695c83-cf69-4ad3-9ef8-2af299f34ede/4855591647.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/burimurupezudej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a09dc78-eea8-4ebd-b18e-a07ce6432f03/81371309629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa162765-f533-451b-8b62-3c1f3d408358/52177246303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4c1d35-828f-40b8-a248-01024323e4c0/vonupugomosikiwofibinimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b688ada-b7ab-4703-9c9c-3bb5fef56c13/hiro_kala_vs_skaar.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/barbershop_quartet_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ea04c6-645a-47a1-aef2-4ab31f83bbdf/19387081089.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 5416 bytes
SHA-256: 14aa5b8f2bf351be7332d0ee1bf3c036232f197a19223e3838883e933332768b
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 11412 bytes
SHA-256: e4d965134925e1db925d01b7b53956e3db01ff621697fbbe81bbb93ad29c1ffc

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