Malicious PDF — malware analysis report

Static analysis result for SHA-256 9deaeebdc330583f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 01:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9b6225987114ab5d14f3cd225a9d88bb SHA-1: 94996874d76f0e9c2a1e4e8bc43e53a1a9f06959 SHA-256: 9deaeebdc330583fd5c2330a15d22039948216e39627153ecfbacef2704e4ea7
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic firings indicate that this PDF is designed to redirect users to malicious infrastructure, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+do+companies+use+cost+volume+profit+analysis In PDF document text
    • http://mesretly.xyz/arabic_keyboard_for_windows_xp_freefnz9w.pdfIn PDF document text
    • http://vkysnaya-eda.site/relezak4x2l3.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/4649800.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/d9hdib2/riposte_definition_pronunciation.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/kobural.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/eDQfs4h/nezodamazusorovuna.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hhYcut5/78554218812.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/fvheNih/100_bts_songs_offline.pdfIn PDF document text
    • http://eurostore.info/gabelli_gold_fund_fact_sheetjjsnl.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/50216c75db1c26.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/dgdhdLj/pattern_lock_screen_jio_phone.pdfIn PDF document text
    • https://zarokosa.weebly.com/uploads/1/3/5/3/135300057/89e9d44249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/chaubandi_ma_patuki_track.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/add_icon_into_button_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/airmon-_ng_kali_linux.pdfIn PDF document text
    • http://velefejaforafe.rf.gd/akira_movie_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/81636051527.pdfIn 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_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5516 bytes
SHA-256: da06323034eb3cbb4a04bde7dab4475adafb38d97c27c0f45bfe8f287893a453
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10892 bytes
SHA-256: 8e9b6620d67549f49126097c05b0f7a5fe5481d706b9c10bc5ac000e502bd23d

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