Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbe61d48d38ee90…

MALICIOUS

PDF

67.6 KB Created: 2020-12-07 12:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 554e8645a4cf85d385e83cc192eb4a1a SHA-1: 40b46999d404d5a3ed278b8d9ba74222bf5022e5 SHA-256: fdbe61d48d38ee90e6702a0400edbb891fca90b39ae0e10785a7742d7ddb351c
252 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to known malicious redirectors or are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the primary attack vector appears to be the redirection via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/aws?utm_term=thyroid+guidelines+2017 In PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/4878c.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/9801948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc59a38ddcca.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/zovuvelifebos.pdfIn PDF document text
    • https://nupinugazazani.weebly.com/uploads/1/3/4/7/134726661/disopukatolu_kevutosuzitop_kifamipoxi_bagoxe.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/raporijefuzisovurozo.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/b0e0d52d-585a-4c2e-8511-31648dbe16bd/doletetox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18713df132613bbc22f2b/t/5fc592dee18c5c478eba9079/1606783712219/cadmium_yellow_vs_lemon_yellow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daff0581-e914-4fa1-802f-ff884c4f088e/91300787994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca8cade-8038-40e5-8353-c95abc513d81/xenigezejaxijutivox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f309898e-8b1d-41bd-8f82-69f0673dedb5/statistics_formula_sheet_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/surf_report_lyall_bay_cam.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/informative_speech_about_bullying_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f23d5b7-dc88-4d55-af9e-e134e8d11c0f/zasidofowakerafumanumawir.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_off0000cb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5B 5332 bytes
SHA-256: cdf88df06cdb45d456f15e6312ac08700e22ebeb5f4006549bd3f8f06afd118c
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 10580 bytes
SHA-256: 125273069aac65ec0b61c1c8e76319c1fd7213285df2e1e132b3c70887b5543f

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