Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a177aff0394c289…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 01:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c97d2803d0468d86eb2e62f32a8c54 SHA-1: c71f68bb32f256695b6b47571331f705a9d455e7 SHA-256: 4a177aff0394c2890998c230a4722b2a454e66688b74493eab5e7bd4c9886bcc
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'botokaw.ru'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=flannel+sheets+king+size+bed
    • https://cdn-cms.f-static.net/uploads/4528260/normal_5fe8606b97782.pdf
    • https://cdn-cms.f-static.net/uploads/4414514/normal_602096737e82e.pdf
    • https://cdn-cms.f-static.net/uploads/4380090/normal_60534192090fd.pdf
    • https://cdn-cms.f-static.net/uploads/4408862/normal_600f93f0382de.pdf
    • http://nabavawuzafurur.mygamesonline.org/fafabupagubunegaritodo.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fdafcfc1667a.pdf
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fed20c291433.pdf
    • https://cdn-cms.f-static.net/uploads/4392873/normal_602a1885cf0c8.pdf
    • http://fovoxarofej.getenjoyment.net/acer_aspire_one_cloudbook_11_hard_drive_upgrade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0939c576-cd4b-41e5-b053-74bb27e3a68d/siwekebopovetapavilu.pdf
    • https://uploads.strikinglycdn.com/files/6b855fd0-09f7-4296-97ef-e712680108a8/40625384682.pdf
    • https://uploads.strikinglycdn.com/files/564c9d4f-af43-4a7d-b44f-036b8b4a7882/pelavefiwire.pdf
    • https://uploads.strikinglycdn.com/files/ac709fe9-8a98-45f6-b41d-d5753a977226/77588316229.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/pozutikanuzoxawizurixaro.pdf
    • https://s3.amazonaws.com/jafujasiwetid/census_2011_summary_report.pdf
    • https://s3.amazonaws.com/veraxawewib/luxig.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_2064bed99e084668a77264f3f67eceb0.pdf?index=true
    • http://gubawakelu.onlinewebshop.net/poxoxinozo.pdf
    • https://s3.amazonaws.com/sepawi/89926324175.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_0aee7512f40c4bafaad380be96825e2d.pdf?index=true
    • https://s3.amazonaws.com/baxadelefofibuz/pyramid_and_cone_surface_area_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/13d882ea-f025-472c-bbb0-585522a064b7/what_is_the_conflict_in_the_veldt.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead3.bin
adcb3a66623c7c4ecbc9e37fb87d66a32a279a8e802f8b7d6bb206ee4e932341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5200 bytes
font_01_sfnt_off0000fc88.bin
753dbde31cda461e803ad5bb933183c7b04ff6a9ac67475a298e8eece31f7f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10676 bytes

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