Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ed9dbfc835bff0…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 23:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 94b2ea3a50a9be452da680b4e828320c SHA-1: 98e8a3cd3b2e5feaf2f7a32fcf4728bb59814c33 SHA-256: 56ed9dbfc835bff0d253faafa60d127c0c8c9794ff9ba4eeee85cce66cffbe2a
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting a tactic to distribute traffic or obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=english+for+business+communication+cambridge+university+press+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fcfee8bdad5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_60081a542b9be.pdfIn PDF document text
    • https://ledatomonuv.weebly.com/uploads/1/3/4/6/134686063/firasuwawado_keradebatuses.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/AgdQIhf/88091732753.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/njejhfB/wink_news_weather_girl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_60193921c9a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6021a42b396a1.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/heiigdW/hilly._io_unblocked_games.pdfIn PDF document text
    • http://itabody.space/16453307404oisf2.pdfIn PDF document text
    • http://drnextact.xyz/8672806218192nw5.pdfIn PDF document text
    • http://health2health.online/12768473855ir5k7.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/09a78898870.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/nudojeluxu4c2g.pdfIn PDF document text
    • http://fortuneo.best/32108552760cni7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_6060924360768.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/Ngityji/liferpg_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/ceijgc9/gupevoxufijote.pdfIn PDF document text
    • http://topcabinets.xyz/67392718902621uf.pdfIn PDF document text
    • http://lbaranaydin.com/warhammer_40k_character_sheetszdpz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_604189e70e3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_5fe853502c8fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 5828 bytes
SHA-256: 3a145f0c8477d672a9eb8a422e088a67ee19bfb4cdc5d29a14a29c263a311238
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11396 bytes
SHA-256: 0395af3b593a4f817670c3b4f3edb1f1584f5d596e4895cbef0f5d68c3e3de4a

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