Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7b06f1a9f8e580…

MALICIOUS

PDF

75.6 KB Created: 2021-04-11 20:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e1e9338635d59315e57c83cf426b38a SHA-1: bccf6877511f021253d6e9e49c77bf20603066de SHA-256: bf7b06f1a9f8e580be8f0e8299c7190e03b0c309881ff8e3e98d258deebe8e1b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, and the document body was heavily truncated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=is+there+a+free+phone+book
    • https://mamotuzukaw.weebly.com/uploads/1/3/4/4/134438076/zuvofazavunivolam.pdf
    • https://retarabad.weebly.com/uploads/1/3/3/9/133997928/8173077.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6060c71563a80.pdf
    • https://cdn-cms.f-static.net/uploads/4470967/normal_604178c739dbf.pdf
    • https://cdn.sqhk.co/zaliroded/hethdig/danmachi_memoria_freese_mod_apk_9._3._0.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/029011d7.pdf
    • https://cdn.sqhk.co/makubeku/exFhgBI/vikings_season_2_episode_10_imdb.pdf
    • http://sdorovie-sustavi.xyz/bailes_de_la_sierra_huayno_ayacuchanafaif.pdf
    • http://giocodigital.space/38017066055e70ds.pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/norawipugosepewog.pdf
    • http://goldstein.berlin/83497105878ateah.pdf
    • http://biolinkus.me/vexejaripox1ty8n.pdf
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/4717017.pdf
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5fe18e33364be.pdf
    • https://xebazasasixuj.weebly.com/uploads/1/3/4/6/134641459/fufela-vefuravosar-fodobixo-jamenexud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_20790900363a4017a7a9bb791f6e395f.pdf?index=true
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_fc062fd714c6494fa5477d0fd46dd32d.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_5986c2758fa743aba8bdbf5a153020f3.pdf?index=true
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_ea84f32b3c9d4359a56733a9d5096471.pdf?index=true
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_82db909651384557a3aae234f03722a2.pdf?index=true
    • 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_off0000e997.bin
cd1b60044b371dde50a4d20e1afb64748a6b8515c3edffff78b8aeaa81a89135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 5100 bytes
font_01_sfnt_off0000fae4.bin
4d7a0d2e47c1dd1ebc7a804c4e37b74bda89eb15d7bdd45581e83e99080cfb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 11260 bytes

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