Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b1d78c328cebab…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 17:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e51914a3394f62ddb3089bccb131bf65 SHA-1: 141dc29fe048aa17101e8e7bb384dabc913bc9fe SHA-256: f8b1d78c328cebab102d6fafbdbc13222c5cf16846e65ae60513ddcaf5e7ab56
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://bologen.ru/123?utm_term=walden+university+msn+nursing+informatics PDF link annotation
    • http://desazunipoxi.22web.org/howard_miller_grandfather_clock_oiling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60243afaca610.pdfIn PDF document text
    • http://lulaterunudagob.iblogger.org/fawonodi.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/2391987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_603e5df29f715.pdfIn PDF document text
    • http://usecabinets.xyz/kaththi_sandai_songs_free_starmusiqzo2ro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_60166e028233e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_60257a9ae7d31.pdfIn PDF document text
    • http://ru-payment.casa/how_to_make_feed_for_poultry_farm70fh2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_60286063a86f0.pdfIn PDF document text
    • http://educationonline.website/444210024273mq5u.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/raduwesevulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_23d7776f3e3a4ff89cc289e84db44c92.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_25acffcd92ab4e79847855d12dff94d7.pdf?index=trueIn PDF document text
    • http://zasufogokalo.rf.gd/how_to_fix_a_dvd_player_that_opens_and_closes.pdfIn PDF document text
    • http://dokufexazag.epizy.com/forefront_identity_manager_2010_r2_deployment_guide.pdfIn PDF document text
    • http://tujuzenu.epizy.com/autolesiones_psicologia.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_af1de70ccf0f4aa9a8773f159fd0645f.pdf?index=trueIn PDF document text
    • http://modefumagija.epizy.com/wojixobewawaxalor.pdfIn PDF document text
    • http://fidepogomuvi.rf.gd/consent_form_template_for_child_travel.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_40d86ee08b6b429a8bcd86f0b6715837.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_829cda655509471e92bfce2da7df6aa9.pdf?index=trueIn PDF document text
    • http://gezexibubaju.rf.gd/rich_dads_cashflow_quadrant_robert_t._kiyosaki_audiobook.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 5516 bytes
SHA-256: a8aa76eca090f237c012e1f426a417a8562e78a7598e2fe7cb01cc3740896a45
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11564 bytes
SHA-256: db6872d1f25716511b8d07c9e71c39bc6e80921d0fb616080217d5f4c382fa19

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