Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9832d0bf4e10d…

MALICIOUS

PDF

74.1 KB Created: 2021-01-04 01:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea572c72fbfac517305d88967bcc30ab SHA-1: 37d35f630018129ad015c7c1f639a9b670c34896 SHA-256: 6bb9832d0bf4e10d9e6436492ecaa20e9ecf3dac4c932cf347042d8eecace80a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=wrong+turn+free++mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fc24dac93790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5f9a3d1dae1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_5fb50a3f82aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8f897c355fe.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/siwumefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fbae2831d6d7.pdfIn PDF document text
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/eeb8add9141567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5fc9d2f812985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fdbd5119f6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fb2bbc2aea12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f99e0c0e8c78.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/xaliwalufoguni/what_is_coliform_in_drinking_water.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/bsc_magazine_august_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/nuwifufadikenegexufil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6d6c83-8239-4f27-a0be-431d56e03987/90046190784.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 4904 bytes
SHA-256: ab2683e95cfc573405ca9b9ae46e4e9cb721f746262599652529b2dbf33f415f
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 10680 bytes
SHA-256: a1a53502e7297c11fa140320d74af3fffd5eb3ac66c102b9df68bbafc0ef455b

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