Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5bce6835047dde…

MALICIOUS

PDF

75.4 KB Created: 2021-05-30 21:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3deba74271ad33fe256a7b9ddebb3d8b SHA-1: b24788cc4e9511eb7adeb1909221b14c23d41492 SHA-256: ec5bce6835047dde8f9da902af699cf14c01b1901715acb350a7d7f1c70ef954
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://leonvi.ru/123?utm_term=unsafe+abortion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427498/normal_6006583cb3318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_60166fe39dde3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5fe675c85db78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_60643302008b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_6051f0dc5c85c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fcf83c911ec3.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/1411714.pdfIn PDF document text
    • https://wivezinafixozut.weebly.com/uploads/1/3/0/9/130969190/mufiroriwow_sasituzilajopa_mofedamigijuguw.pdfIn PDF document text
    • https://todonuratalojin.weebly.com/uploads/1/3/4/6/134605818/noseluwazomize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fdff29cb381a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_605d77903abe4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5ffd992e23c7f.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/2919856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_6039d91984bbf.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/8777a0ef-3bc4-4c95-a967-7d78b63787b9/tafonewireboxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781844f1-1e8c-48bb-8098-17cd05d2ee48/duduwoxosimisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9152f5a8-d35e-4673-af2f-64264de3699e/newababejekupivuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be238583-5a45-485c-92f1-f02c452eaee2/83623405455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e21344-5bbb-4e6a-b645-781e75731dd5/xowutebipiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08277f54-2660-4c34-bca9-7c352069a54b/3048472891.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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5132 bytes
SHA-256: f60bd89cdd21556de432cead35ed865a4320f48b0d9265d69f075e711a732bcd
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 11644 bytes
SHA-256: e78aa7ae9c7c7f55be1eb5749be22b82b0c8491c998ea59b30358357deeda928

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