Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4ea130439a3e46…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 01:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d6ce77e7f72dd5cb5be105b1d733e0e4 SHA-1: 6211d3653e0d635ec37a42e1821a8e5bc38912e1 SHA-256: 6b4ea130439a3e4658a39573051df46bff79cef725ab0f4c30d9b66ce6ddf52c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains like weebly.com, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF's structure suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://leonvi.ru/wix?keyword=autumn+dynasty+apkpure PDF link annotation
    • https://seladimara.weebly.com/uploads/1/3/4/4/134460986/4dbb7fc5852.pdfIn PDF document text
    • https://fibutoledul.weebly.com/uploads/1/3/2/7/132741024/gowedijivomano.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/rujezesu.pdfIn PDF document text
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/zejefowida.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/warileginovomes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5ffa2033bb995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_5fc64ba382cf1.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/706ace4bc483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_600078b1cdf13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_6041839e2a9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_604d36593d09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_6016a9b0d1c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fda90141d833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_6014c82196c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_6040e36a77c65.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/tosododo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/difigomisosak/elazko_philips_azur_performer_calc_clean.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/world_map_for_kids_printable.pdfIn PDF document text
    • http://duvubatas.rf.gd/97986343724.pdfIn PDF document text
    • http://wufutogaj.epizy.com/93308887105.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/31062987666.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 4952 bytes
SHA-256: 9b16fba3e9caf7b4925409b3aac499dc6c9f8785bcf3d8d653d96d4747f56f22
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 11400 bytes
SHA-256: 1f4669a6478ea77d8eb9ba3939211e7e82bbdc20692660a6bc2d26f2145046ef
font_03_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230