Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb66d3c768964cb…

MALICIOUS

PDF

88.5 KB Created: 2021-02-23 00:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4fd38f3aeb5e7ed5df56af4cabd615c8 SHA-1: eb141888f0ba5cd307f506d357c5e9efa0eabd8b SHA-256: 6bb66d3c768964cbd26a2778a9482899c5cc12f5abb424aeb4606f607cb69695
136 Risk Score

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wb?keyword=elementary%20reading%20comprehension%20strategies%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6014073ad821c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_601e70e2283fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5ff093d62886f.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/2598545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5ffd47dcf0d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6025431948ede.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/389858.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/vabexeli_monobazufodex_kiretara_kuvap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419827/normal_5fe3ed142e8a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464541/normal_60013a0c9d946.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/sepovutapakogaf/about_us_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/costain_group_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/support_vector_machine_kernel.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/61184318049.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/76809123318.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_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 5628 bytes
SHA-256: 7ea7b30bdb1efd54401d03ba8a4cc5aff84699b2f30a3cb60fa8da75cb7a03b1
font_01_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 10840 bytes
SHA-256: 5b44485271e27e6f243918411d1674f2b8d24f5740f6d423ebef075e522b9af7