Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9be5814f3db52a…

MALICIOUS

PDF

71.8 KB Created: 2021-02-09 14:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c40dd5e3a1cc52fbad34d3e8f52bc49 SHA-1: ba0ef4e97274bbaedc8e0b0cfd0775c9feca9fc5 SHA-256: 6c9be5814f3db52adb15356179d1543fe4c32be92ae57f3f1e1770603f40707c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The document body, though partially corrupted, contains metadata related to 'Crayfish aquarium guide' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=crayfish%20aquarium%20guide PDF link annotation
    • https://jiduwaramusova.weebly.com/uploads/1/3/4/8/134854614/fimaf.pdfIn PDF document text
    • http://lunurapezos.iblogger.org/97558265142.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/nibifubiv_jopok_bafadogabeg.pdfIn PDF document text
    • http://trokot-shopnew.online/20955308528yozjd.pdfIn PDF document text
    • http://wgathering.org/carrier_services_android_que_es0q1ie.pdfIn PDF document text
    • http://leree6.club/to_kill_the_irishman_bookqqwej.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/6278629.pdfIn PDF document text
    • http://instacopyrightcenter.com/9215710643t6pnp.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/14cd9b3aad060b.pdfIn PDF document text
    • http://moitender.org/guvamazutapovomawaay9x.pdfIn PDF document text
    • http://topekabur.iblogger.org/neurocritical_care_status_epilepticus_guidelines.pdfIn PDF document text
    • http://amst-watch-v2.club/exorcist_stairs_how_many_steps0a68k.pdfIn PDF document text
    • http://subbellassecret.com/pina_colada_song_sheet_musicswu6o.pdfIn PDF document text
    • http://seamanygau.best/stats_table_top_hockey_puckeqc3r.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/4544752.pdfIn PDF document text
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/teruvigafagatavuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonowodiguvab.epizy.com/mosis.pdfIn PDF document text
    • http://ditajizuru.rf.gd/cet_designer_free.pdfIn PDF document text
    • http://rexonaboruli.epizy.com/the_devil_movie.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5420 bytes
SHA-256: b47456cbd1e6063767220a0432a1e0e09387ee9361cc86e4217db701e07799bc
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10608 bytes
SHA-256: 8da95ab2fc7f19171b790cf5cc101fe743389e6ad52f3abcf1b430382d408548

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