Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e87a2cfe2162659…

MALICIOUS

PDF

74.8 KB Created: 2021-04-11 02:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb92ef2aad9cc9c6f494995675c1bee2 SHA-1: 728cda1d6f09b1fc46c211cf5b189aaa0da16118 SHA-256: 0e87a2cfe21626591a2b9929969f0753a8707bedd5134284e2523f15b09134f1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://pelibifir.ru/strik?utm_term=livro+geometria+analitica+boulos+pdf
    • https://cdn.sqhk.co/pelotuwew/3hKCo1O/hustle_castle_diamond_hack_2020.pdf
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/nabavujivazuxoviwovi.pdf
    • https://cdn.sqhk.co/dadirowuj/Adagjhb/73677058917.pdf
    • https://cdn.sqhk.co/xemugugafot/cB0Smhe/rabaliz.pdf
    • http://zurabutodiriwa.22web.org/tisarelilowudoduze.pdf
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/suvemijupik.pdf
    • https://cdn.sqhk.co/berirenike/QJZjbih/gilepifamafa.pdf
    • https://cdn.sqhk.co/dolafita/MPhjghq/lofudem.pdf
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/lubube_wawikugijug_jowiwe_jazonadi.pdf
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/3231364.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/zuzujotakorono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refusunono.onlinewebshop.net/schindler_s_list_violin.pdf
    • http://tifilow.onlinewebshop.net/definicion_de_balistica_forense.pdf
    • https://uploads.strikinglycdn.com/files/feb20d96-271d-435d-af85-7f0ed3eea672/65211886268.pdf
    • http://gitojaxekeveki.onlinewebshop.net/fungal_pathogenicity.pdf
    • https://s3.amazonaws.com/widofafane/sexovusetasiwaj.pdf
    • https://uploads.strikinglycdn.com/files/47749a59-8ab2-4f75-9bee-b50aa56362e1/rafanisagiguwidimorawawo.pdf
    • http://kibisabekod.rf.gd/is_there_a_2020_ipad_mini.pdf
    • https://s3.amazonaws.com/loranoduzuja/endorsement_agreement_template.pdf
    • http://xitiwefebulu.rf.gd/64664427569.pdf
    • https://uploads.strikinglycdn.com/files/dba293fa-1aaf-49a0-9c73-9a4e903f20b2/2012_toyota_highlander_oil_change_frequency.pdf
    • https://uploads.strikinglycdn.com/files/70e7a036-a2fb-4683-802a-0bc232630a93/winchester_gun_safe_lock_reset.pdf
    • http://negekaludizex.rf.gd/71191159607.pdf
    • http://mimitudoxofi.rf.gd/24903204655.pdf
    • http://nazowovemozugiv.myartsonline.com/xorogisi.pdf
    • http://tulajadulixo.myartsonline.com/20502696344.pdf
    • 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_off0000e143.bin
c9c38a306ceb0767e38cbbf87905d4ddbbd091444857b325fe091771b0a9c886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 5616 bytes
font_01_sfnt_off0000f44b.bin
f4332cd60b8c36a336f00eacf958657fd48f64d5a6dbd1294b01d16013cc2bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 13268 bytes

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