Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8301b3604093cc…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 03:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f0f8b2eeba692a8d244a7a4b05090d96 SHA-1: 9422e4db15ecf61ca0be414af19faf2049231d9a SHA-256: ce8301b3604093cccabd48c4cc9357c1848db7bc92e92d904f57805a0c7d395c
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 0.9998

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://kuzutuzo.ru/123?utm_term=barracuda+email+security+gateway+400+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd67e43099cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383340/normal_6008de8c5c037.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/acute_pulmonary_edema_in_pregnancy.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/basic_life_support_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383295/normal_600881431b2f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_6005ebe838485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_602e7d8c72cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_604ec078a1e13.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/winajax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_6013076613ac8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc0e635-64a7-4585-bfec-fce7ff2bcd5d/linksys_wrt54g_setup_without_ethernet.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_260d7689ca0d49308e285f6853b441bb.pdf?index=trueIn PDF document text
    • http://kugajevekafino.myartsonline.com/validity_of_experimental_research_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cf45c7-858c-4ad1-96a9-0c27aa05f332/nail_salons_near_me_open_late.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_22415b2dba0840d89453550a8bdcae02.pdf?index=trueIn PDF document text
    • http://besafetusupug.atwebpages.com/67261452646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205fc451-c02a-4830-86be-1ce8db9b3ca1/87389877236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7574700c-d68b-411a-8c2f-c57205e430b4/washington_2020_football_schedule.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 5824 bytes
SHA-256: e5a27eeae0db3b341e5d75e89aaf2681073fd6eb7aba8b834ec3f144cb03318c
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 10500 bytes
SHA-256: c698bbf03c486ecfc52f7dff6af9fa31e577c6cc115e412957457a43e894d572
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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