Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fbc270eea7b7c8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-01 23:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 57c6aab24aa3438f3678177295a8a5e6 SHA-1: 8edcc320eadc6c545f82a9eee8f917c102389044 SHA-256: a4fbc270eea7b7c8c8bc17611f05147630e1eeb87d02998870d3211e71dd856c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to external, potentially malicious websites. The document body, though heavily obfuscated, contains a title related to tax laws, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/aws?utm_term=new+tax+laws+for+2020+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447101/normal_602ba71870848.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/lL1hhjc/97119601976.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/hahedZT/mindset_quotes_for_elementary_students.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jjibifq/fruit_slot_machine_games_play_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/rgjjije/famanilaxutoguribep.pdfIn PDF document text
    • http://aazzzry.space/stress_strain_diagramdh55i.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/gfifUWW/44247291221.pdfIn PDF document text
    • http://pumba-timon.space/jufufebariguwobemaxusodiftkdfq.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/Qen4yid/wivunurokekokoremi.pdfIn PDF document text
    • http://momelekunizu.22web.org/carnivores_2_mods_s.pdfIn PDF document text
    • http://bhd-management.space/753110675urcf.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/ipiegea/risotevufarizexajizejisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6037eae2b0bf7.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/ibKUgj5/merge_dragons_hidden_level_grimshire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6014c7c3cc0de.pdfIn PDF document text
    • http://ledimpress.biz/kasonimarwyy7o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_601d5da51a69e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5fffdeb687498.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/bUihQc7/78439362368.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jaifgjv/sopatafumufokenofunur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/59711026051.pdfIn PDF document text
    • http://kexasejuwodeji.epizy.com/archive_folder_in_gmail_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 5304 bytes
SHA-256: 7abf340088aec4f4339c36bccfb1cc3eab999aa5bfeef1e0e1afeb3c37387328
font_01_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 10596 bytes
SHA-256: 979c1a2ac8cacb87330181d468ed5d11c6c4924debbff7fb0fcfdc51a8148daa
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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