Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53772b8e40d2fa0…

MALICIOUS

PDF

73.1 KB Created: 2021-03-24 07:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d9536da3423113fbde7a03eb6ec78284 SHA-1: 599f9cb7a4a50bf3ab09702d2db14198f73cc8ec SHA-256: a53772b8e40d2fa06e663ab83abb58829a47919dff79beccdf73501b9196c380
156 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 0.9997

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 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+set+quartz+radio+controlled+clock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fd1eacc92038.pdfIn PDF document text
    • https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/6f1742e8e.pdfIn PDF document text
    • https://fuxobubexozemag.weebly.com/uploads/1/3/4/7/134752644/pibad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5ff8c13b20d36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427293/normal_5fcf929455fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_603295ce8e968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6055bacd43c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_601d234927bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_604e68dd0ab1c.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/nowali_segubudedomuz.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/gorasugamud-nibajakanidoz-getiku-nelivevaxabizu.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/99ae5bcf-f5fc-4ed3-b089-9af7f9798763/88039196669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d25b49-e0d8-488b-af0f-018b20797aca/does_scarlett_2i2_work_with_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fede0f5-3ca8-4695-b6cd-b0ad680f3012/34399296947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c4e998-5c08-4b1d-80f4-9f7c54a557c0/in_a_dark_dark_room_and_other_scary_stories_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8389eea0-3288-4eb5-82c3-08be4be61702/situmudujadijubuweredulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb61aa38-575f-40e9-9908-62212d25b888/netgear_wnr3500_router_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cfa9e6-c65b-43bc-8a48-bbbf23da74c7/garelli_supersport_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67758e6b-2e8d-4d3b-b956-85a77cf1d823/xopisutak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904b642a-5e97-421d-9c23-1537a4d2e775/list_of_gluten_free_snacks_to_buy.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5228 bytes
SHA-256: 1f1956ac7cb2a517d1022325e5cfaba09f0829c6bd5f78573567881d3a7bb7c1
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 10536 bytes
SHA-256: 05c33e3ab5f7d547dff02a46c7ff9e6035f97ca10e743528111a42b75e36153b

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