Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9038f5767f9e3ba…

MALICIOUS

PDF

68.0 KB Created: 2021-04-05 10:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d9616b6fe147f2ba8467bfe5b2161486 SHA-1: 051b731514c022bf8df46e935397a690c23cf0ee SHA-256: e9038f5767f9e3baa01c5aa069d3f05650cbe12515a0bcb8436512789ea11620
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary malicious URL, https://mezovuduw.ru/award?keyword=little+oxford+thesaurus+pdf, suggests a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=little+oxford+thesaurus+pdf PDF link annotation
    • http://vipmanmarket.space/53253917306bnstm.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/85826105762lrfym.pdfIn PDF document text
    • https://bumijukepemuno.weebly.com/uploads/1/3/4/7/134728240/266195.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/184379.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/raseb-kevebe-teboko-pagiziwefatufiv.pdfIn PDF document text
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/16834a964.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/hjgiiaO/geometry_dash_lite_levels.pdfIn PDF document text
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/nazofobebupusakefavo.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/TViaIia/zombie_tower_defense_unblocked.pdfIn PDF document text
    • http://cabinetsapp.xyz/71655816012d9cyz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_e6af2e4ae5a040149affe3a5b07b3760.pdf?index=trueIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_e353ec308dd346c2a3f00b2300c730a6.pdf?index=trueIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_5b7b547dab5a4d119b2734e7895eea44.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_6c14558eae534732a205b1350644d35c.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_2da2bd9c599c41f9acd12a04bef9aa1d.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_dafaa0b7d3c84be49cff161baa4e5ecc.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_f3cf9637dc904ded8613d5d8113d69f7.pdf?index=trueIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_806f768564c34a3b8eb4c74d374dcec7.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_6f33906431d24f9ea6e6b9a1ee9af159.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_54b8191abf924a27b7f6f3beb02cc9ed.pdf?index=trueIn 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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5136 bytes
SHA-256: 93f0bb6f8a06a240f1cc567f2d8d9968cf417528fc3d0bed7c79c2e1e1297200
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10464 bytes
SHA-256: 1c51a78f21cee9ea3c0da11b2077e03458ca4decba8e30dd4bcedbff872babb4