Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c427aead66b100d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-10 09:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed069f600381abea7a539ba760204627 SHA-1: 92305df3836d4f448188c76cea55277e5dabbd05 SHA-256: 1c427aead66b100d6619fce28840090501eb5f3a73b125f757a3700dc3953287
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/wix?keyword=chainfire+3d+apk+without+root PDF link annotation
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/divawuwadofigujan.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/Qsggcg0/fokepeboxuwomurete.pdfIn PDF document text
    • https://joketivuwotida.weebly.com/uploads/1/3/1/4/131454049/ba362.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/4132503.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/81829.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/1b1409c69492d1.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/23144d9006d6e89.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hojgtif/9475521176.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jagcb23/42556334155.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/mufulexerini-golusuker-wuxojaguzadade-wasino.pdfIn PDF document text
    • http://sportplays.ru/kowusutaxzsgil.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/2b249ad170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5fd2efb70a407.pdfIn PDF document text
    • https://fevegukiso.weebly.com/uploads/1/3/1/4/131482975/sowat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5febd3300e832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_60257f2acf417.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/QjjFggg/iheartradio_apple_watch_3.pdfIn PDF document text
    • http://help-ruleviolation.com/1978_ford_truck_shop_manual3s5m4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_6029aaeb1c2aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fff7b6305151.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/idiejgo/girl_x_battle_2_dating_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_5b83db3d98ea49b5adbc2f424917bdfe.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_72ac890c575145488a6224f8723f45eb.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_5ae031ed840a4bfa9280b55801e53df9.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c30319c3fc8e44758c00fa446832db43.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_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 5144 bytes
SHA-256: badbf1f6545add71cb232b440a0790ae51c7b61fdfb60c0d4ea9561e02a960ba
font_01_sfnt_off00010db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 10448 bytes
SHA-256: 6592bd77d4ed4b9c57ad4a958248ab0a0f7ac8fe575c02bb318f64ec1ba49ef8