Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea53b89041ac4032…

MALICIOUS

PDF

85.4 KB Created: 2021-04-09 00:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a354427ecd79c914a03da8f0ca9665be SHA-1: cef869c104a4a4263221152fd69affb16e2311a8 SHA-256: ea53b89041ac403217a20e2b008640cbd7032fbd26520d8ff4a4a50a04dda32b
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/strik?utm_term=etc+smartfade+2496+software PDF link annotation
    • https://winuvuvivadasuj.weebly.com/uploads/1/3/4/4/134480566/jotadadabusotesog.pdfIn PDF document text
    • https://gogidexiveje.weebly.com/uploads/1/3/4/7/134762038/0444555b3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_604d910c943a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd298aecf81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_600b79881fa49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_605610b4bf335.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/resekasudipu.pdfIn PDF document text
    • http://jegagavakunumog.iblogger.org/enter_sandman_piano_sheet_music.pdfIn PDF document text
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/palulud-fojudo-wuzaligefidopun-derovasis.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/8362804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_60655d4f853fc.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/zewojevoxawateravafa.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/xarupebu_zejupopejadawej.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/622955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422645/normal_5fddf7bd1b7e2.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/7bd18b46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_5fd116bc12c68.pdfIn PDF document text
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/3233140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6036e0e5e9ca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc6dcc897526.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/temujonuwu/42521433242.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/vosofamutorokaxedaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/gogok.pdfIn PDF document text
    • http://supedir.epizy.com/benivudule.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/2838053306.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/67423434884.pdfIn PDF document text
    • http://raredinufewota.epizy.com/gst_audit_form_9d_in_excel.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_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 5716 bytes
SHA-256: ca48cc9c5169838ce0c04309f0190eebafb6a572be9435a7bbb999fa40afedae
font_01_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 12792 bytes
SHA-256: 40544572d18a4207fb10b665ea03fec4f08db4b331adcc74d013240dfebf49fa