Malicious PDF — malware analysis report

Static analysis result for SHA-256 528f17641eea0ed7…

MALICIOUS

PDF

75.3 KB Created: 2021-05-28 05:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a85d9d18721dd7b81f421b8d349181d5 SHA-1: 2d8b9159aa84a9e237b11e8e634afcae8e3ea839 SHA-256: 528f17641eea0ed7af17546057327371ee1504fbc416f622eb34f8913ecfab00
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=fusionner+plusieurs+pdf+en+un+seul+fichier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374380/normal_6009b1873e869.pdfIn PDF document text
    • https://fesifikigit.weebly.com/uploads/1/3/5/3/135319823/9cb06f9.pdfIn PDF document text
    • https://noribiri.weebly.com/uploads/1/3/5/3/135347041/6ab04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffbc710efc62.pdfIn PDF document text
    • https://kegorobaz.weebly.com/uploads/1/3/5/9/135963119/xaromiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_60530a5b86b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_605ef32e1405b.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/3683311.pdfIn PDF document text
    • https://pijagifodila.weebly.com/uploads/1/3/4/3/134308300/zupob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fea26bd8adec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_602c7135bc0b5.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/gixubire.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/nonexumajimatunono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601996fb390a1.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/selilin-bitopoleguni-pimurakonijaga.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/safakepavitasawotar.pdfIn PDF document text
    • https://xaguverage.weebly.com/uploads/1/3/7/5/137513239/bopiraxiza.pdfIn PDF document text
    • https://regisaralox.weebly.com/uploads/1/3/2/6/132681556/lefipomimunipujejaw.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/d8d36b87df.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/e25c8f9a-64d9-4bf9-a157-27def0cb3750/parolezaremisokopupiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751b0cf9-29ba-4dae-9482-f5252ff4315a/30973730187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cb168d-2e14-4c39-a9f2-0b36e4a9dec0/5_love_language_test_for_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1ec128-bdb6-4764-9d1c-15598826b79e/jifeson.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 4988 bytes
SHA-256: a8ba51f518f98486f4e0719e674aef0577c3b343fc49f259fab702f672f2a2f4
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 11828 bytes
SHA-256: 0d27dd8fcccffd87f7db7584c511495d38bccf76a82b2cc03fb9f9832b7f8fa5