Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad722b91f32c77e…

MALICIOUS

PDF

82.3 KB Created: 2021-06-09 23:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bbf736bab1beaaa890f9e096036d7bad SHA-1: ee4f898f0219bb7c4ed7140c2df29c5fcbb964e5 SHA-256: 5ad722b91f32c77eeb78f56516c4462e58223f5b91f0ada685ed317ec4f06a64
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ML classification and ClamAV, which flagged it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'beautiful fonts' and application metadata, indicating a potential lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=beautiful+fonts+for+android+mobile PDF link annotation
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/1a3406dc69c.pdfIn PDF document text
    • https://zufopawel.weebly.com/uploads/1/3/4/4/134462865/38412.pdfIn PDF document text
    • https://vowobonu.weebly.com/uploads/1/3/4/8/134853209/lipezazebaxus_lizebowubadire_wemesowenaz_butirusobobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_60135eb71de8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602b7f49bef9d.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/b1e983c6ac046eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6029f08be644b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_604ff110781a0.pdfIn PDF document text
    • https://lixotesit.weebly.com/uploads/1/3/4/6/134655402/de579d3ff3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_5fe64e69e224d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2747be8c-7551-4c2a-ab62-569fba56a184/xuzozedixudabotoguf.pdfIn PDF document text
    • http://giribuv.pbworks.com/w/file/fetch/144924489/gegari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbeeaa9-f730-4108-918a-5ef9c417c00a/febomozusuzinovasavizasev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfee077c-13de-4231-90e2-bfc4ad3ae627/nititadi.pdfIn PDF document text
    • http://dokadeku.pbworks.com/w/file/fetch/144828564/58830810717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45a7850-ecc6-4a57-9d30-9980ad7d5941/48354544907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0f38ec-44e8-4b69-9921-951a82ee12ca/xezukon.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144423711/reverse_fmea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efed291d-3798-4182-b9c8-859bab01aa1c/devivapeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c430e2ab-6663-4f12-a6b9-055c56b623ff/noleli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b176a8e-085b-4c3c-8a3f-7ce8a3a2c39d/94030079088.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5124 bytes
SHA-256: 30b0bd2dadabe8f043424669641d795235cafc0532ba9d509c21c64cfd7eb25b
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10512 bytes
SHA-256: 7636833fa879ef9ae05697c7252ef55e00fff501f82f8c07c4d4624c898f58ab
font_02_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176