Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3b5f21f8d2e6fc…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 07:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f5767a0390b6c8e51891d9233a01850 SHA-1: e7a7070337150a43c2ebb6a0cacceddb2d68b633 SHA-256: fc3b5f21f8d2e6fc44f0af8cfc0fe95c37e16bf676fc69f79a724c953fc4d6b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/aws?utm_term=best+brain+teasers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368735/normal_601f56f017dff.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/3980092.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/atividades_do_mei_2020_em.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/gusirevulepaxolafil.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/wutitixamo.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/complete_key_for_schools_download.pdfIn PDF document text
    • http://bolawixefop.mygamesonline.org/education_should_be_free_for_everyone_argumentative_essay.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/5e76ffbb95ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403282/normal_6004562884f11.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/63625159302.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/23c15515a5dde1.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/dowesitobuga/56349932286.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/simple_service_agreement_template_doc.pdfIn PDF document text
    • http://posikin.myartsonline.com/arteria_iliaca_externa.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_776a10b7ff724dadb86b3bc0f00ec8f5.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_57a6e03835794a92b0008bebe4970e38.pdf?index=trueIn PDF document text
    • http://kakasis.onlinewebshop.net/dasoxopusonagovij.pdfIn PDF document text
    • http://gufopexolax.myartsonline.com/durga_saptashati_path_vidhi.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 4836 bytes
SHA-256: 44b90f0bff9474ec1d709320519bf1a4d08d74f83add130fadf7da75f176a231
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10804 bytes
SHA-256: 4d13b242cf0f27ce75a03172e5b31b0014437c31e154d4591b77b9d037073b15

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