Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c961009190361a7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6ed5fa4f73c15ea3557addd9a94ad2d9 SHA-1: d6a627d269c41308c7b789eb6abdb67fd43368dc SHA-256: 0c961009190361a78c876bd369d466c11871cb98c20e50dc4c3887fb02ab4248
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 of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=bengali+to+english+translation+exercise+pdf PDF link annotation
    • https://milenafevolok.weebly.com/uploads/1/3/4/6/134654592/somojotarewinagisufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_600944db5ed0e.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/trastornos_alimenticios_en_nios_y_adolescentes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_603f446b6af9d.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/gonet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fd24e2b685ae.pdfIn PDF document text
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/pidebedodujubodutu.pdfIn PDF document text
    • https://genopajixon.weebly.com/uploads/1/3/1/4/131452954/2104888.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/8913150.pdfIn PDF document text
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/a6c52a48c3eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_601de2410235b.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/zutuxusewebatunug.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/26d80eaf5.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/lekizopiloref/rudolupelabijudasab.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/87657889557.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/que_harias_si_no_tuvieras_miedo_loreto_sesma.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/gmail_sheets_mail_merge.pdfIn PDF document text
    • http://fawikinego.myartsonline.com/41411166998.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/bsc_1st_year_maths_question_paper.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_28ee2bb9401a4a6aae60a0cfc79ec815.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_b697eab7dbdc4503a0f54f8bd36ce2a0.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 5532 bytes
SHA-256: b4a873c95db38785d5fefc7698bef6c41fb74ddc342b27b6287a2d7128f604fa
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11172 bytes
SHA-256: 247ad26226a9a9e9a8f1105e24cf6fdb9adecc99f3fcaa939264724b56c6b73e

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