Malicious PDF — malware analysis report

Static analysis result for SHA-256 03972d74e2836f28…

MALICIOUS

PDF

82.8 KB Created: 2021-03-09 14:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eff79965750855720431c4cd4b1502b2 SHA-1: b9a09875fcf2685c219b2a3f79ee23a573949903 SHA-256: 03972d74e2836f28cd1b40f296ea875b9f6b704c8b0fbee64c6e1723ae9c2b59
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://fokemale.ru/award?keyword=working+time+regulations+2020+pdf PDF link annotation
    • http://lawexape.mygamesonline.org/antecedentes_heredofamiliares_historia_clinica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_604611cdf34e3.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/begaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_6046b47d3fcdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_601b565aca54d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5feb95ec28d50.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/0718ea5a039e2.pdfIn PDF document text
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/e371beccd5d4.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/vegota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fd7cafa41bb2.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/vulabiduf-takudaza-buduji.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/8faf5be417f.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/temelupa.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/1386f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_c80380a5c30247dea8dd9a807639dc1a.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_4429711ed840456db2ff999ad9e4bf64.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_46eee72fb10b4317ace652853b061ac6.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_244ec954fd224be7a0f3f6e7c959153f.pdf?index=trueIn PDF document text
    • http://wumafopid.onlinewebshop.net/vtech_digital_answering_system_dect_6.0_manual.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_c9c7b05958bf4d1da438203b9f30762a.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_814b49e563c9419c846e74e352cba505.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_0933dd7cd6844091b3dfc6827ffae867.pdf?index=trueIn 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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 5712 bytes
SHA-256: 3b4eb108f560697677c27e11b4ab2f052aaac551819c24834b877ab9ad2d173d
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10128 bytes
SHA-256: e85dba90332006e46194680b95111861e47853ab3f9bf6ccfd9b5829d3983faa