Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb980ecaca11af1c…

MALICIOUS

PDF

76.6 KB Created: 2021-06-06 06:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 49d78c706bcdcbf5d0d3425060f18cc7 SHA-1: 5544bbc3f5f424abc485b0a6604a60f094709c9f SHA-256: bb980ecaca11af1c7b623454a3f49eaecb0642fcd813c66a3f609aaa06af6f62
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm. The document body, though heavily obfuscated, contains text referencing 'IRS transcript' and specific codes, suggesting a lure for phishing or SEO spam. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cructi.ru/pbw?utm_term=code+971+and+570+on+irs+transcript+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410727/normal_6014590ded5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fdc6ea9881c2.pdfIn PDF document text
    • https://naputurezakir.weebly.com/uploads/1/3/4/4/134485320/908390f85fec1.pdfIn PDF document text
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/e02e8cc.pdfIn PDF document text
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/woruzanoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_60281a1509ea5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392470/normal_60b5d08707d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_605c1aed7cbc7.pdfIn PDF document text
    • https://xusukimijep.weebly.com/uploads/1/3/2/6/132681495/674077.pdfIn PDF document text
    • https://wubawujol.weebly.com/uploads/1/3/4/2/134266052/joromidabifekerexar.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/017a7c654334d1.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/makutawep.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/4638748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupataved.pbworks.com/f/9813043967.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144705231/zoxewa.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144421140/kixibomewopefalufot.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/dicionario_portugues_ingles_baixar.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/zalumuzidirorexupinu.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/petty_cash_count_sheet_template.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/2470438162.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5624 bytes
SHA-256: 185be4927e745ddcbfa0117cde5aecef51ea212708478f47109cbc8c6b8b114a
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11044 bytes
SHA-256: 8921c2da63480bae03be8b20a60c71235dc86bad456f392ef5de508d45cc1cac

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