Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4ea09a99757cc2…

MALICIOUS

PDF

68.7 KB Created: 2021-02-19 20:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04c69550d52d32f91efac8c7a91b4873 SHA-1: d1703591b616e6a158b94f2dc087746777af795e SHA-256: 1b4ea09a99757cc25d22b6102d37af215514521b61998a9e11f3fdcedf42d7df
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting or redirector infrastructure, suggesting it's part of a link farm designed to direct users to malicious sites. The presence of a link to a known malicious redirector further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://crophysi.ru/123?utm_term=vera+edge+home+controller In PDF document text
    • https://nufomesamibu.weebly.com/uploads/1/3/5/3/135332564/7117480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_600b645658611.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/b5c5b.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/gakejerogasojewumedo.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/online_feedback_system_project_report_in_php.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fd334813ec89.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/9366689.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/wimafixatono_nesajesipo_pinamaleru.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/7941353.pdfIn PDF document text
    • http://kukukoboda.22web.org/48243105137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601237fda3e79.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/zumezeviwakiz/insurance_comparison_spreadsheet_template.pdfIn PDF document text
    • http://wusumuforibit.epizy.com/vitevav.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/defective_product_report_ema.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/32988639471.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/chutkule_hd_video.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_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 5140 bytes
SHA-256: a561d9da83c3ae635ae9d2560301fd96b2c86ebfd665ab114fcaae65fcb3bd81
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10420 bytes
SHA-256: 671ff9f33939c7200d8bf0b835c1c0b1ca4119eb8b86e1d01e5312dc7cf60add

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