Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11332847675da20…

MALICIOUS

PDF

77.6 KB Created: 2021-03-11 09:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c41d9742a814c51b58d156ff076b51b SHA-1: 181a51e55d563565e4240b3d646764edc140e62a SHA-256: c11332847675da204bfe4d1d63321fdabfe39d8b1dfd547ec21f3e258c11b4fa
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 0.9995

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://leonvi.ru/award?keyword=android+phone+codes+unlock+pdf PDF link annotation
    • http://shoop-fk.ru/vogipavuf8xrr.pdfIn PDF document text
    • http://floradoma.net/338025931072ex1h.pdfIn PDF document text
    • http://cccckkkkkdd.space/vizio_32_inch_tv_wall_mount56dx3.pdfIn PDF document text
    • http://nutristrike-shop.ru/93607553311dkpwq.pdfIn PDF document text
    • http://repair-kompov.ru/lukosurakaqlxd2.pdfIn PDF document text
    • http://gromstroy.com/apple_employee_benefits_401k_matchqazbt.pdfIn PDF document text
    • http://instapresent.site/day_4_21_days_of_abundance_meditation_deepak_choprauee6z.pdfIn PDF document text
    • http://tovelksa.website/73646571709lwncc.pdfIn PDF document text
    • http://nenugatigubom.66ghz.com/pupujenefalulugozaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/crappie_fishing_guides_in_arizona.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_ee534c3b937148f1a142f4b237777965.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_95bc5039785443cea55c192a684c6702.pdf?index=trueIn PDF document text
    • http://xigoraviwa.epizy.com/android_tv_remote_control_api.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/setting_boundaries_worksheet.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_3c26f63b96de43b2a0cb4b0222745715.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxegeza/61294778919.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_ef3b84fd1cc24b90a29958e994f46ad9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/52091044026.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/52847171754.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/94542812791.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_31baccb18031475db4acac586f4ff160.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_77e1baa5769a44c79fc6993b0dd9552e.pdf?index=trueIn 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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 5084 bytes
SHA-256: cc9d92e84377c550994fffa73f0de176515b72906ff605210979d9273bbc84c7
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10536 bytes
SHA-256: feff4c2e6f82123c0bd9168d25a50103df3aae43dc9d93489f7c91646b55e67b

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