Malicious PDF — malware analysis report

Static analysis result for SHA-256 3565574b22ddd0a2…

MALICIOUS

PDF

80.7 KB Created: 2021-03-18 13:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4e405519dd97a5e459c4dfb1d051c3c SHA-1: 0b87489bf57ea690ac02128cd720a885fdc5d7ef SHA-256: 3565574b22ddd0a2c8cc81f169d0ff3d1f2c96ccb0b5489da34d83a176e0656c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/123?utm_term=cha+cha+slide+music+video PDF link annotation
    • http://besemafobekilir.22web.org/alphabet_worksheets_for_preschoolers.pdfIn PDF document text
    • http://ita-bio.space/exercices_sur_le_groupe_nominal_cm14zyy6.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/dhdhdif/spina_bifida_hydrocephalus_life_expectancy.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/lasejedoxibub.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/55424035749.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/QgiSoia/10539042300.pdfIn PDF document text
    • http://i-men.ru/45372698499eallw.pdfIn PDF document text
    • http://virona.org/70028607920st7q4.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/fAxidge/tumblr_blade_runner_2049.pdfIn PDF document text
    • http://zatawonilar.iblogger.org/5_types_of_power_in_leadership.pdfIn PDF document text
    • http://prosale.company/405945649777306g.pdfIn PDF document text
    • http://golixudib.mypressonline.com/69150988205.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/gfjdjfK/61313622861.pdfIn PDF document text
    • http://sodalabs.pro/nizudesuvimazitelaffngm0.pdfIn PDF document text
    • http://lg-copyright.com/16025270679f5bwc.pdfIn PDF document text
    • http://handler-autoscout24.com/967293547210sulu.pdfIn PDF document text
    • http://onlinekartiadesi.com/gexarepovomewqwmf.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/dgf42ia/43745374742.pdfIn PDF document text
    • http://shoppingyxplus.xyz/fusion_360_windows_10_won_tp0c3z.pdfIn PDF document text
    • http://bighome.space/880583734651iziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/94889715615.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/kijirepoduruzuraputifo.pdfIn PDF document text
    • http://gixufedexakav.atwebpages.com/tratamento_farmacolgico_da_doena_de_alzheimer.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_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 5048 bytes
SHA-256: 55b9ae0bf76d879d55fcea66370c2dd08c0f5a0423cae70a3aab2177f92e5b16
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10768 bytes
SHA-256: d0646bc518ab4ce661d83be6280625b5b8d10bd31d2be8ec58825016ccb66569

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