Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fd84f01d6ffbea…

MALICIOUS

PDF

82.4 KB Created: 2021-02-27 03:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c1f1280a79c859e98c0981e1e5163389 SHA-1: 51f9a129fb7bd9c235c7bdbddce8f8f4cbb9cb27 SHA-256: b1fd84f01d6ffbeaabb35f994db86c8f66b95f2a598c6f67ec056635a6e8087d
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary URL, https://soxebez.ru/strik?utm_term=black+and+decker+digital+advantage+iron+walmart, suggests a potential SEO manipulation or phishing lure. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or lead users to phishing 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://soxebez.ru/strik?utm_term=black+and+decker+digital+advantage+iron+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd6e20cd0b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_602d3a4098101.pdfIn PDF document text
    • http://gevixadita.22web.org/happy_wheels_ios_levels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5fca303658ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_602c4ebf8a857.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/munajadagiluroj-welinage-zijidusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5ff98aaa91272.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/bijifeno.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/jabudut-wapur-kutobob.pdfIn PDF document text
    • http://labagokawiboze.22web.org/1359551370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_60397abf84925.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/zisulamisozoto/wetetelojuridi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/quickbooks_audit_trail_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/widigetokupanamare.pdfIn PDF document text
    • http://xokesuluz.epizy.com/cricket_news_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_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 5348 bytes
SHA-256: 067db6e455abe2b1fcecc503f7ce107cec38800dae6e136452af121017989283
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 11600 bytes
SHA-256: 154b667ec1554808c52e02fd9950d19ec72c38bffb98f99aca7786b1d67d2a90

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