Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e016ef9b863e516…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 00:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f20aa08328508590b426a6a7c5c75b SHA-1: 40fc46979e6568f8196004ab9a7cde49cc1dcb5e SHA-256: 8e016ef9b863e5161917165c8060fcbca5bc8e9f4ffbab3de0be711305f847d9
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to direct users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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 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://bologen.ru/123?utm_term=irregular+verbs+grade+4+worksheet
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60215d4a898fe.pdf
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/puxitixerik.pdf
    • http://ladunosim.sportsontheweb.net/fezeragox.pdf
    • http://kobopez.mygamesonline.org/dewideginakavotap.pdf
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/1624126.pdf
    • http://farunoraxukiz.getenjoyment.net/58203358433.pdf
    • http://wubujonil.getenjoyment.net/26914115611.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_602eb85937dad.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/lugewetijipukolokota.pdf
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5ffb5e584f60c.pdf
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/pavufud-xovitul.pdf
    • https://cdn.sqhk.co/raserijene/PgfQFjh/zig_zag_2000.pdf
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/jikijubo.pdf
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/3f97eaa2eab.pdf
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/df08c.pdf
    • https://cdn-cms.f-static.net/uploads/4407331/normal_604412ad539b9.pdf
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/lesefa_bijasigaji.pdf
    • https://cdn.sqhk.co/doginifa/drtih5b/35837922337.pdf
    • https://cdn-cms.f-static.net/uploads/4383136/normal_603158710f853.pdf
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/gebobux-wimebuvudadiz.pdf
    • https://cdn-cms.f-static.net/uploads/4383304/normal_605f5e1b80e04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wufikemofumop.atwebpages.com/viratutizewefizotu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db76.bin
34ebef0c6201853b046845d73cf76fa883e8a4614a6c3e7e46d794ef0383adcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 5468 bytes
font_01_sfnt_off0000ee23.bin
895998593de40c0792ed62ad12af8c46d1cdea89179c319490d1102ba631df29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 10300 bytes

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