Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f265a97e45899e0…

MALICIOUS

PDF

78.5 KB Created: 2021-04-23 17:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5479f8d8a3564a138f507ab9bd234f68 SHA-1: b61bacf1a15a545f553bd557ea23af0918510dfd SHA-256: 2f265a97e45899e0f4746c496b58940480fa6e046ab433ab8999a474b9fc0a6b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the embedded links are the primary attack vector, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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=trane+cleaneffects+filter+reviews In PDF document text
    • http://vizezokope.iblogger.org/sebepipetujalu.pdfIn PDF document text
    • http://sanasojan.22web.org/uebnice_eskho_jazyka_pro_cizince.pdfIn PDF document text
    • http://kismykeitio.best/skyrim_german_language_pack_razor1911_download3thhk.pdfIn PDF document text
    • http://zelenege.iblogger.org/biochemistry_usmle_questions.pdfIn PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/7372383.pdfIn PDF document text
    • http://gavixed.iblogger.org/brixton_spatial_anticipation_test.pdfIn PDF document text
    • http://sqrab.top/bhojpuri_song_2019_dj_remix_video1fw6s.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/weloni.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/calendario_laboral_barcelona_2020.pdfIn PDF document text
    • http://hookup671.site/what_is_the_rarest_eye_color_for_blondes5f3zf.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/jitefunuxawogu.pdfIn PDF document text
    • http://ehaberdevlet.com/550039891765xmd2.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/mukepaje-medami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_932c475ee678423799bb5f4f90693191.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_a5c1dc68d829428ebb07d220bf52f0a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/messenger_lite_terbaru_2019.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_5cce45953ec640818843b04887cd8b95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/23907878024.pdfIn PDF document text
    • http://watuvul.epizy.com/puzuwo.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_7cacb3bc7869486dabfd65d99a5d6da9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/b_ed_result_2019_kuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/gejinodasegudaweko.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_985c60d240064e1d8f2b8eadf04d350e.pdf?index=trueIn PDF document text
    • http://dowixewobi.epizy.com/public_relations_n5_textbook.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_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 4976 bytes
SHA-256: 2ef7f796cf4dade6ebac08b5c8f679706f90fa018855a3783a5d121c0b798536
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 11508 bytes
SHA-256: c296cc772598ac87d0f823b255d5cbd6bd17197ca5e167b1d3ea431e2c64ac67